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. Price. The term bid refers to the highest price a buyer will pay to buy a specified number of shares of a stock at any given time. The term ask refers to the lowest price at which a seller will sell the stock. The bid price will almost always be lower than the ask or âoffer,â price. The difference between the bid price and the ask price is called the spread.