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 bid price is the price that someone is willing to pay for that stock, the ask price is what someone is willing to sell that stock for. If the stock is up to $1, for exampâ¦le, when you buy it the lowest someone is willing to sell it for could be $1.01, and someone else may be willing to buy it at $.99.