Which of these is most likely to make you sleepy while you’re reading?

One investigating company tracked all credit card purchase during 2012 and measured two variables: (1) the type of credit card used (visa, mastercard, american express, or discover), and (2) the amount (in dollars) of each purchase. identify the level of each variable measured.

wilson's has 10,000 shares of common stock outstanding at a market price of $35 a share. the firm also has a bond issue outstanding with a total face value of $250,000 which is selling for 102 percent of face value. the cost of equity is 11 percent while the preminustax cost of debt is 8 percent. the firm has a beta of 1.1 and a tax rate of 34 percent. what is wilson's weighted average cost of capital?

Suppose that electricity producers create a negative externality equal to $5 per unit. further suppose that the government imposes a $5 per-unit tax on the producers. what is the relationship between the after-tax equilibrium quantity and the socially optimal quantity of electricity to be produced?