
To derive:
The demand for Milk, Tuna and national defense.

Explanation of Solution
The grocery store sells multiple products that are essential for daily life. Milk is an essential food item and almost every family consumes it. However, a rich family consumes high-quality milk while a financially weak family consumes lower quality milk. So, in order to increase the demand- the grocery store keeps different varieties of milk. So, that customer of every income group, can buy as per their need. Secondly, offering packets of milk of different weights would also increase the customers at the grocery store.
The rise in the number of tuna eaters will increase the demand for it. Since easy availability of product induces the customer to demand more. So, in order to raise the demand- the focus would be on its supply and quality. However, the demand for national defense can be increased by creating a war like situation or by focusing on the security of the nation.
Meaning of Demand: It means the quantity of any commodity which a consumer is willing to purchase at different prices in a given period.
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