Why does money have a time value?

Money has a time value because a sum of money available today can be invested to earn a return, meaning it has the potential to grow into a larger amount in the future. This earning capacity creates an opportunity cost: if you delay receiving money, you give up the chance to invest it and earn interest, dividends, or other returns during the waiting period. The time value of money underpins discounted cash flow valuation, bond pricing, pension calculations, and the comparison of investments with different timing of cash flows. It also reflects other real-world factors, including inflation and risk, but the foundational reason is the ability of money to generate returns over time. Option A is incorrect because purchasing power does not remain constant; inflation typically erodes it, which reinforces time value rather than removes it. Option B confuses the driver with a market parameter; interest rates influence the size of the time value effect, but they do not explain why it exists. Option D is incorrect because investment growth is typically compound rather than linear.