According to the table below, what is the marginal cost of producing 90 units of output?QFCVC01,0000201,000350501,000700901,0001,0501251,0001,4001451,0001,7501601,0002,100

It is difficult to practice arbitrage for untradable services or for goods which have a few knowledgeable traders

Indicate whether the statement is true or false

Profits

A. are a cost of doing business because they are payments to others. B. are not a cost of doing business because they are owed to resource owners. C. are not a cost of doing business because they are often zero or negative. D. are a cost of doing business because entrepreneurs would not incur the risk of starting a business if they didn't expect to earn profits.