The barrier to entry that allowed Alcoa to make persistent economic profits was ownership of an essential input.
Indicate whether the statement is true or false
Question 2
Some economists argue that Microsoft become a monopoly in the market for computer software by developing MS-DOS, an operating system used for the first IBM personal computers.
The more people who used MS-DOS-based programs, the greater the usefulness of a using a computer with an MS-DOS operating system. The explanation for Microsoft's monopoly is
A) the development of new technology that other firms could not copy.
B) network externalities.
C) patents Microsoft obtained when it developed the MS-DOS operating system.
D) control of a key resource which, in this case, is the MS-DOS operating system.
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