The graph below shows demand and marginal cost for a perfectly competitive firm. If the firm is producing 100 units of output, increasing output by one unit would ________ the firm's profit by ________.

Given the currencies below, which was not replaced by the Euro?

A) German mark B) Irish pound C) British pound D) French franc

As demand for phone apps increases, other things being equal, we can expect

A) a decrease in both the relative price and quantity of phone apps. B) a decrease in the supply of phone apps. C) more phone apps to be produced. D) an excess number of phone apps in the market.