Where can I find a definition of psychological barriers with respect to marketable securities?
GuruFocus has an excellent summary of psychological barriers in the markets:  http://www.gurufocus.com/news.php?id=88451 I will teach you to be rich blog is all about psychological barriers and behavioural change. "I think ""Psychological Pricing"" is a similar phenomenon to what you are looking for.  This is where retailers use certain numbers in prices because those prices are more appealing to consumers.  Since stocks - and in your case bitcoin - have prices, they too will be more or less appealing at different prices based on psychology alone."
In fact markets are not efficient and participants are not rational. That is why we have booms and busts in markets. Emotions and psychology play a role when investors and/or traders make decisions, sometimes causing them to behave in unpredictable or irrational ways. That is why stocks can be undervalued or overvalued compared to their true value.  Also, different market participants may put a different true value on a stock (depending on their methods of analysis and the information they use to base their analysis on). This is why there are always many opportunities to profit (or lose your money) in liquid markets. Doing your research, homework, or analysis can be related to fundamental analysis, technical analysis, or a combination of the two. For example, you could use fundamental analysis to determine what to buy and then use technical analysis to determine when to buy. To me, doing your homework means to get yourself educated, to have a plan, to do your analysis (both FA and TA), to invest or trade according to your plan and to have a risk management strategy in place. Most people are too lazy to do their homework so will pay someone else to do it for them or they will just speculate (on the latest hot tip) and lose most of their money. Those are the three books that were considered fundamental at my university: Investments - Zvi Bodie (Author), Alex Kane (Author), Alan Marcus (Author), Stylianos Perrakis (Author), Peter Ryan (Author) This book covers the basics of financial markets. It explains how markets work, general investing principles, basic risk notions, various types of financial instruments and their characteristics and portfolio management principles. Futures and Options markets - John C. Hull This book goes more in depth into derivatives valuation and the less common / more complex instruments. The Handbook of Fixed Income Securities This books covers fixed income securities. In all cases, they are not specifically math-oriented but they do not shy away from it when it is called for. I have read the first and the other two were recommended by professors / friends now working in financial markets. I’ll start with what worked for me, to get me hooked. This list is by no means exhaustive.   *One Up On Wall Street* by Peter Lynch discusses competitive advantages and staying close to the story of a business. Explores the concept of ‘buy what you know’. He has also written *Beating the Street*.  *The Drunkard’s Walk: How Randomness Rules Our Lives* by Leonard Mlodinow is not dissimilar to *A Random Walk Down Wall Street*, but I preferred this book as it explores the concepts of randomness and survivors bias.   *Against the Gods* by Peter Bernstein is a dense book, but in my opinion is the definitive text on the development of numbers, probability theory, and risk management. I absolutely love this book.   *The Most Important Thing* by Howard Marks is immensely readable, enjoyable, and looks at value investing for the long run. Howard Marks has been a macro behavioural investor before behavioural investing was a thing.   Speaking of behavioural biases, *Thinking, Fast and Slow* by Daniel Kahneman is a spectacular look at how your brain’s quick-trigger responses can often be wrong.  On the subject of behaviour and biases, *Influence: The Psychology of Persuasion* by Robert Cialdini is another topic-defining book  More books by long term veteran professional investment managers that should be enjoyed: - *The Little Book That (Still) Beats the Market* by Joel Greenblatt - *Beat the Crowd* by Ken Fisher - *Big Money Thinks Small* by Joel Tillinghast - *Common Stocks and Uncommon Profits* by Philip A. Fisher - *The Little Book of Behavioural Investing* by James Montier - *Margin of Safety* by Seth Klarman  And I’ll be banned from this forum without mentioning *The Intelligent Investor* by Benjamin Graham.    As per some other comments, my personal opinion is that books that describe events or periods of time like *Liars’ Poker* [80s Junk Bonds], *The Big Short* [Financial Crisis], *When Genius Failed* [the LTCM collapse, excellent read by Rogers Lowenstein], *All The Devils Are Here* [by McLean and Nocera, another Financial Crisis book, much better than Lewis’s, IMO] are all educational and quite entertaining, but don’t honestly have much to do with the actual nuts and bolts of the real financial industry.   Enjoy! Traditionally, dealers and broker-dealers were in contact with the actual producers of a product or issuers of a security, selling it at the exchange on their behalf.  Consumers would traditionally be on the buy side, of course. These days, anyone can enter the market on either side.  Even if you don't hold the security or product, you could sell it, and take on the risk of having to stock up on it by the delivery date in exchange for cash or other securities.  On the other side, if you can't hold the product or security you could still buy it, taking on the risk of having to dispose of it somehow by delivery in exchange for cash or other securities. In either case you (the sell-side) take on risk and provide products/securities/cash.  This is most commonly known as market making.  Modern literature coins the terms liquidity taker (buy-side) and liquidity provider (sell-side).  Even more accurately, risk management literature would use the terms risk-taker (sell-side) and risk spreader or risk reducer (buy side). This is quite illustrative in modern abstract markets.  Take a market that allows for no offsetting or hedging because the product in question is abstract or theoretical, e.g. weather trading, volatility trading, inflation trading, etc.  There's always one party trying to eliminate dependence on or correlation to the product (the risk reducer, buy-side) and the counterparty taking on their risk (sell-side). Good addition. When learning finance and business, /u/msattam, realize the world does not work cleanly like it does in a textbook. You have added complexity, both systemic and human caused. And that there is a very good reason that we must understand agency issues and how to mitigate those risks. While the issuer of the security such as a stock or bond not the short is responsible for the credit risk, the issuer and the short of a derivative is one. In all cases, it is more than likely that a trader is owed securities by an agent such as a broker or exchange or clearinghouse. Legally, only the Options Clearing Corporation clears openly traded options.  With stocks and bonds, brokerages can clear with each other if approved. While a trader is expected to fund margin, the legal responsibility is shared by all in the agent chain.  Clearinghouses are liable to exchanges.  Exchanges are liable to members.  Traders are liable to brokerages.  Both ways and so on. Clearinghouses are usually ultimately liable for counterparty risk to the long counterparty, and the short counterparty is ultimately liable to the clearinghouse. Clearinghouses are not responsible for the credit risk of stocks and bonds because the issuers are not short those securities on the exchange, thus no margin is required.  Credit risk for stocks and bonds is mitigated away from the clearing process. Thanks for your reply. I’m not familiar with the term “Held-For-Trading Security”. My securities are generally held as collateral against my shorts. To clarify, I am just trying to track the “money in” and “money out” entries in my account for the shorts I write. The transaction is relatively straight forward, except there is a ton of information attached! In simple terms, for the ticker CSR and short contract CSRUQ8, the relevant entries look something like this: There are no entries for expiries. I need to ensure that funds are available for future margin calls and assignments. The sale side using covered calls is as involved. Hey thanks for your response.  The commodity is actually electricity, so definitely not able to store.  Would you mind giving me a short summary of your thought process or an example of how you compare liquid markets vs illiquid ones when looking at more traditional commodities?  If that is a bit much to ask, as I am sure it could get quite involved do you have any reading recommendations?    This little project has sparked an interest. Support and resistance only works as a self-fulfilling prophecy. If everyone trading that stock agrees there's a resistance at so-and-so level, and it is on such-and-such scale, then they will trade accordingly and there will really be a support or resistance. So while you can identify them at any time scale (although as a rule the time scale on which you observed them should be similar to the time scale on which you intend to use them), it's no matter unless that's what all the other traders are thinking as well. Especially if there are multiple possible S/P levels for different time scales, there will be no consensus, and the whole system will break down as one cohort ruins the other group's S/P by not playing along and vice versa. But often fundamentals are expected to dominate in the long run, so if you are thinking of trades longer than a year, support and resistance will likely become meaningless regardless. It's not like that many people can hold the same idea for that long anyhow. Not directly an answer to your question, but somewhat related: There are derivatives (whose English name I sadly don't know) that allow to profit from breaking through an upper or alternatively a lower barrier. If the trade range does not hit either barrier you lose. This kind of derivative is useful if you expect a strong movement in either direction, which typically occurs at high volume. It's about how volatile the instrument is. Brokers are concerned not about you but about potential lawsuits stemming from their perceived inadequate risk management - letting you trade extremely volatile stocks with high leverage.  On top of that they run the risk of losing money in scenarios where a trader shorts a stock with all of the funds, the company rises 100% or more by the next day, in which case the trader owes money to the broker. If you look in detail you'll see that many of the companies with high margin requirements are extremely volatile pharmaceutical companies which depend heavily of FDA approvals. Historically there weren't really high barriers to get in, but I find nowadays that banks are looking for quant backgrounds (MQF, ME, MFin) even though it isn't really required unless you're working in modeling. Maybe pursuing a master's program would help.   Another route considering your BA experience, you could try to get involved in regulatory projects at a bank. It's a bit of a longshot since they tend to use consulting firms. Get involved with that and you'll interact with risk reporting teams and could work from there.   Other than that, get a lucky break haha, knowing someone definitely helps. You should check out existing resources like Investopedia for definitions, and ask questions if there is something you do not understand, instead of asking folks to spit out definitions. A good book for you to read might be Wall Street Words "Although this has been touched upon in comments, I think the following line from the currently accepted answer shows the biggest issue: There is a clear difference between investing and gambling. The reality is that the difference isn't that clear at all. Tens of comments have been written arguing in both directions and looking around the internet entire essays have been written arguing both positions. The underlying emotion that seems to shape this discussion primarily is whether investing (especially in the stock market) is a form of gambling. People who do invest in this way tend to get relatively emotional whenever someone argues that this is a form of gambling, as gambling is considered a negative thing. The simple reality of human communication is that words can be ambiguous, and the way investors will use the words 'investments' and 'gambles' will differ from the way it is used by gamblers, and once again different from the way it's commonly used. What I definitely think is made clear by all the different discussions however is that there is no single distinctive trait that allows us to differentiate investing and gambling. The result of this is that when you take dictionary definitions for both terms you will likely end up including lottery tickets as a valid form of investment.  That still however leaves us with a situation where we have two terms - with a strong overlap - which have a distinctive meaning in communication and the original question whether buying lottery tickets is an investment. Over on investorguide.com there is an absolutely amazing strongly recommended essay which explores countless of different traits in search of a difference between investing and gambling, and they came up with the following two definitions: Investing: ""Any activity in which money is put at risk for the purpose of making a profit, and which is characterized by some or most of the following (in approximately descending order of importance): sufficient research has been conducted; the odds are favorable; the behavior is risk-averse; a systematic approach is being taken; emotions such as greed and fear play no role; the activity is ongoing and done as part of a long-term plan; the activity is not motivated solely by entertainment or compulsion; ownership of something tangible is involved; a net positive economic effect results."" Gambling: ""Any activity in which money is put at risk for the purpose of making a profit, and which is characterized by some or most of the following (in approximately descending order of importance): little or no research has been conducted; the odds are unfavorable; the behavior is risk-seeking; an unsystematic approach is being taken; emotions such as greed and fear play a role; the activity is a discrete event or series of discrete events not done as part of a long-term plan; the activity is significantly motivated by entertainment or compulsion; ownership of something tangible is not involved; no net economic effect results."" The very interesting thing about those definitions is that they capture very well the way those terms are used by most people, and they even acknowledge that a lot of 'investors' are gambling, and that a few gamblers are 'investing' (read the essay for more on that). And this fits well with the way those two concepts are understood by the public. So in those definitions normally buying a lottery ticket would indeed not be an investment, but if we take for example Vadim's operation example If you have $1000 and need $2000 by next week or else you can't have an operation and you will die (and you can't find anyone to give you a loan). Your optimal strategy is to gamble your $1000, at the best odds you can get, with a possible outcome of $2000. So even if you only have a 1/3 chance of winning and getting that operation, it's still the right bet if you can't find a better one. this can suddenly change the perception and turn 'gambling' into 'high-risk investing'." https://www.hussmanfunds.com/wmc/wmc171009m.png  &gt;The following charts will provide a sense of where the U.S. equity market currently stands. The first chart shows our margin-adjusted CAPE, which as noted above has a correlation of about -0.89 with actual subsequent market returns across U.S. market cycles since the 1920’s.  https://www.hussmanfunds.com/wmc/wmc171009.htm  It will turn, downside potential is historic.