What is the low-ball effect in psychology and why do marketers use it to target customers?

The technique that is used to sell to customers and persuade customers is called low ball

When marketing your product psychological tactics can be used to persuade customers through understanding their behaviour.

There are so many ways to psychological convince your customers to buy your products for example when you are selling health food there are ways that you can manipulate people's mind for example showing them pictures of how unhealthy eating affect the person's body; by seeing those pictures a mind will tell the person to change their behaviour so that they will not look that way.

Knowing how the person brain works in making a decision to buy can help a business owner make the right decisions to persuade their customers appropriately.

no , per capita income is not a true measure of the development because: -it only tells us about average income not how income is distributed among the people.it only give us an idea of the economic aspect.it is only at the qualitative basis.moreover, income is not only the way of development other factors are also as much as important as income.