Cardiac tamponade can occur due to: 1  Dissecting aortic aneurysm (thoracic) 2  End-stage lung cancer. 3  Heart attack (acute MI) 4  Heart surgery. 5  Pericarditis caused by bacterial or viral infections. 6  Wounds to the heart.
Bid vs. ask and why yields matter. With many investments, the concept of bid and ask applies to prices. The bid price is what a buyer is willing to pay for a security, while the ask price is what a seller is willing to accept for the same security. The difference between those two numbers is known as the bid-ask spread, and in general, the narrower that spread, the more liquid the market is.
The ask price represents the minimum price that a seller is willing to receive. A trade or transaction occurs after the buyer and seller agree on a price for the security. The difference between the bid and ask prices, or the spread, is a key indicator of the liquidity of the asset. In general, the smaller the spread, the better the liquidity. 'Bid and Ask' is also known as 'Bid and Offer'. BREAKING DOWN 'Bid and Asked' The average investor contends with the bid and ask spread as an implied cost of trading. For example, if the current price quotation for security A is $10.50 / $10.55, investor X, who is looking to buy A at the current market price, would pay $10.55, while investor Y who wishes to sell A at the current market price would receive $10.50.