"Mom, I want a chocolate" "Dad, I want an Ipad" "Teacher, I deserve more marks" These are all examples of demands made. They may or may not be fulfilled but they are demands of some kind! Of course, the first demand of chocolate can be fulfilled if you are within your ration of chocolates, which could be 1 chocolate per week as allowed by your mom. It will also be constrained by the budget of your household spending, also called expenditure. The second demand of an Ipad will be fulfilled if there is any use of the device for you, referred to as utility. You might want to attend online classes on the Ipad, you might even want to read on it. So if this is justified, your father might give in to your demand given the budget constraint of the household in a particular month. He might need to save for it, just like Sarthak needed to save for his mother's birthday present. Marks! Well, you need to work hard. The effort you put in will be rewarded by yo...