Engineering Economics
A ______ is a market situation where economies of scale are so significant that cost are only minimized when the entire output of an industry is supplied by a single producer so that the supply costs are lower under monopoly that under perfect competition.

Ordinary monopoly
Bilateral monopoly
Natural monopoly
Perfect monopoly

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Engineering Economics
In a cash-flow diagram:

Time 0 is considered to be the present
Time 1 is considered to be the end of time period 1
A vertical arrow pointing up indicates a positive cash flow
All of these

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