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 is opposite of the bid. The ask is the current lowest price at which you could buy. As a rule, you buy it often higher than the ask price. After realize the two terms, we should know another term bid-ask spread.The difference between the bid price and the ask price is called the bid-ask spread. If you would like to sell gold, a broker will offer to buy it for the bid price.And if you would like to buy it, the broker will offer to sell it to you for the ask price. The spread is the broker's profit.he ask is opposite of the bid. The ask is the current lowest price at which you could buy. As a rule, you buy it often higher than the ask price. After realize the two terms, we should know another term bid-ask spread.