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.
Bid and Ask in Day Trading. The Bid is the price at which a broker will buy your current day trading position from you. The Ask is the price at which the broker will sell you the position you require. The gap between the bid and the ask depends on many and varied factors, such as how much liquidity the instrument has, how volatile the general day trading market is, the ratio of day trading buyers vs sellers and so on.