If a market participant believes that a stock price is irrationally high, they may try to borrow stock from brokers to sell in the market and then make a profit by buying the stock back again after the stock falls in price. This practice is called

Blue pens and black pens are close substitutes. The cross elasticity of demand for black pens with respect to the price of blue pens is ________

A) positive B) negative C) equal to 1 D) zero

Use the classical (RBC) IS—LM—FE model to show the effects on the economy of a temporary beneficial supply shock; for example, a decrease in the price of oil

You should show the impact on the real wage, employment, output, the real interest rate, consumption, investment, and the price level.