The substitution effect in economics refers to the change in consumption patterns due to a change in the relative prices of goods. When the price of a good decreases, consumers are more likely to substitute it for other goods, increasing their consumption of the now cheaper good. Conversely, when the price of a good increases, consumers will tend to switch to substitutes that have become relatively cheaper.
Substitution Law is an economic proposition stating that no good is absolutely irreplaceable; at some set of prices, consumers will opt for substitute goods.
