Engineering Economics
What refers to the market situation in which any given product is supplied by a very large number of vendors and there is no restriction against additional vendors from entering the market?

Perfect competition
Oligopsony
Monopoly
Oligopoly

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Engineering Economics
In a cash-flow diagram:

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

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