A product with many substitutes is most likely to be ELASTIC.
Elasticity in economics refers to how sensitive the quantity demanded of a good is to a change in price. When there are many substitutes available, consumers can easily switch to a different product if the price of one product increases, leading to a greater responsiveness in quantity demanded to price changes. Conversely, products with no or few substitutes tend to be more inelastic, as consumers have limited options for alternatives.