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 Price. The listed ask price lives up to its label. The ask is the lowest firm price at which someone in the market has offered to sell shares. If you enter a market order to buy the stock, your order will be filled at the current ask price.The ask is the cost to buy shares at the current moment in the market.he Ask Price. The listed ask price lives up to its label. The ask is the lowest firm price at which someone in the market has offered to sell shares. If you enter a market order to buy the stock, your order will be filled at the current ask price.