I'm just gonna talk about Substituting Demand. I can relate to this particular type of demand more personally because it seems to occur more often in my life than I realize.
I come from a family that doesn't have a lot of money, so for us, grocery shopping is kind of difficult. Many can afford all types of food, such as different kinds of cereal, muffins, Chinese food, lopster, steak, and also lots of treats such as ice cream, cookies, and cake. But for us, cake and ice cream isn't
always an option for us. So, for an alternative, we can still purchase milk and cereal, but what better way to replace something as sweet as cookies for a different kind of sweet?; fruit.
That may not be much of an "alternative" or "substitution" for something like dessert, but for us, it meets
our demand for something "sweet". I'm a
HUGE fruit lover, plus it's low on fat! Haha!
Fruit meets our criteria. So it works out. :)
Now that I know what Substitution Demand is, I now can understand why we buy so much fruit! When we learned about it in class, this fruit thing is what first came to my mind.
But how many people purchase fruit, and how much? And do we increase the amount of purchase for fruit? And do people purchase more candy and sweets than they do for fruit? Is fruit just as much of a (healthy) demand as it is for desserts?