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.
There s the bid price, which is the price another investor would be willing to buy shares of a stock for. And then there s the ask price, which is the price you d have to pay if you wanted to buy the stock. The ask price is generally higher than the bid price, but sometimes they can be virtually the same.here s the bid price, which is the price another investor would be willing to buy shares of a stock for. And then there s the ask price, which is the price you d have to pay if you wanted to buy the stock. The ask price is generally higher than the bid price, but sometimes they can be virtually the same.