Engineering Economics
What is a stock of a product which is held by a trade body or government as a means of regulating the price of that product?

Stock pile
Buffer stock
Withheld stock
Hoard stock

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Engineering Economics
In a cash-flow diagram:

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

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