Financial terminology in cash-flow analysis: A series of equal payments or receipts made at equal time intervals is called what?

Introduction / Context:
Understanding cash-flow patterns is foundational for cost estimation and project evaluation. Regular equal payments over equal periods occur in loans, savings plans, and lease costs, and have a specific name in engineering economics.

Given Data / Assumptions:

• Equal payment amount each period.
• Equal spacing between payments.
• Finite number of periods, unless otherwise stated.

Concept / Approach:
An annuity is the standard term for a level series of payments or receipts at regular intervals. Special variants include ordinary annuities and annuities due, depending on timing within each period.

Step-by-Step Solution:
Identify pattern: equal amounts, equal intervals.Map to financial term: this is an annuity.Confirm alternatives do not fit: perpetuity is infinite; capital charge factor is a rate; future worth is a value, not a series.

Verification / Alternative check:
Loan amortization schedules and retirement contributions are classic annuities; tables/formulas use A, P, F relationships.

Why Other Options Are Wrong:
Perpetuity: infinite series. Capital charge factor: a conversion factor, not a series. Future worth: single lump-sum value at a time point.

Common Pitfalls:
Confusing the cash-flow pattern (annuity) with its computed present or future value.

Final Answer:
Annuity