Engineering Economics
What is the type of annuity that does not have a fixed time span but continues indefinitely or forever?

Deferred annuity
Perpetuity
Ordinary annuity
Annuity due

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Engineering Economics
In a cash-flow diagram:

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

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