Your statement, "When prices are low, people will buy more," is generally true and aligns with the basic principles of supply and demand in economics. Here’s a bit more detail:

### Law of Demand:
This principle states that, all else being equal, as the price of a product decreases, the quantity demanded increases, and vice versa. This relationship is often visualized using a demand curve, which typically slopes downward from left to right.

### Why This Happens:
1. **Affordability**: Lower prices make goods more affordable for consumers.
2. **Budget Effect**: Consumers can purchase more of the good with the same amount of money.
3. **Substitution Effect**: When the price of one good decreases, it becomes relatively cheaper compared to other goods, so consumers may shift their purchases towards this good.
4. **Perceived Value**: Sometimes, lower prices can make a good seem like a better deal, encouraging increased purchases even if the actual need isn’t there.

However, it's important to note that this relationship isn't always perfectly linear or absolute. Other factors such as consumer preferences, income levels, availability of substitutes, and perceived quality can influence purchasing decisions.

Would you like to explore any specific aspect of this concept further?