Engineering Economics
What is defined as the reduction of the value of certain natural resources such as mines, oil, timber, quarries, etc. due to the gradual extraction of its contents?

Inflation
Depletion
Deflation
Depreciation

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Engineering Economics
In a cash flow series:

All of these
Either an increase or decrease in the amount of a cash flow is called the gradient
The gradient in the cash flow may be positive or negative
Uniform gradient signifies that an income or disbursement changes by the same amount in each interest period

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