Price Elasticity of Demand
The price elasticity of demand measures the responsiveness of the quantity demanded to a change in price. When the price elasticity of demand is high, it indicates that the demand for the product is highly sensitive to changes in price. In this case, a decrease in price will result in a relatively larger increase in quantity demanded.

Formula for Elasticity
The formula for price elasticity of demand is:

Elasticity = (% change in quantity demanded) / (% change in price)

Given Information
- Price of a highly elastic agricultural product decreases by 10%
- We need to calculate the expected percentage increase in quantity demanded

Calculating Elasticity
To calculate the expected percentage increase in quantity demanded, we need to know the price elasticity of demand. Since the agricultural product is highly elastic, we can assume that the price elasticity of demand is greater than 1.

Using the Formula
Let's assume the initial price of the agricultural product is P1 and the initial quantity demanded is Q1.
- The percentage change in price is -10% (decrease in price).
- The percentage change in quantity demanded can be calculated using the price elasticity of demand formula:

Elasticity = (% change in quantity demanded) / (% change in price)

Since the price elasticity of demand is greater than 1, the percentage change in quantity demanded will be greater than the percentage change in price.

Calculating the Percentage Change in Quantity Demanded
Using the formula:

Elasticity = (% change in quantity demanded) / (-10%)

We can rearrange the formula to solve for the percentage change in quantity demanded:

(% change in quantity demanded) = Elasticity * (-10%)

Calculating the Expected Percentage Increase in Quantity Demanded
Given that the percentage change in price is -10%, we can substitute this value into the formula to calculate the expected percentage increase in quantity demanded:

(% change in quantity demanded) = Elasticity * (-10%)

For example, if the price elasticity of demand is 2, the expected percentage increase in quantity demanded would be:

(% change in quantity demanded) = 2 * (-10%) = -20%

Therefore, in this case, we would expect a 20% increase in quantity demanded for every 10% decrease in price.