Answer:
The Premack principle
Explanation:
Given by David Premack in 1965.
This principle is based on Operant Conditioning (reinforcement).
The Premack principle states that the chance of getting involved in more predictable activities or behaviors will reinforce less predictable activities or behaviors.
In the given eg. Jean is applying reinforcement, as he asked her daughter that she can play outside after eating fruits.
The simple reason why prices of a commodity go up and down is because if more people want to buy a particular stock (demand) than sell it (supply), then the price moves up.
The price of a commodity will go down if more people wanted to sell a stock than buy it, there would be greater supply than demand.
<h3>What is economics?</h3>
Economics can simply be defined as a social science which studies human behavior in relation ends and scarce means which have alternative uses
So therefore, the simple reason why prices of a commodity go up and down is if more people want to buy a particular stock (demand) than sell it (supply), then the price moves up.
Complete question:
What makes price go up and down?
Learn more about demand and supply:
brainly.com/question/4804206
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