New York, April 30 (IANS): When consumer budgets grow or shrink, spending habits change. In order to keep their favourite items, consumers whose budgets have shrunk to a particular amount will opt for less variety than someone whose budget has increased to that same amount, says a new study.

A common view is that people with a particular budget will spend their money on the same number of products, even when their previous budget was lower or higher.

"We call this the budget contraction effect," said study co-author Kurt A. Carlson from Georgetown University.

"Instead of spreading losses evenly across many items, consumers prefer to focus a shrinking budget on a narrower set of preferred products," Carlson added.

Study participants were asked to imagine that they had won a shopping spree at Costco.

They were to distribute spending across nine different products: muffins, bread, M&Ms, Power Bars, apple sauce, ravioli, two kinds of pizza, and cheesecake.

They began with a $40 budget and wrote down how much of each product they would buy. They repeated the process with an $80 shopping spree, and finally a $120 spree.

The conditions were the same for people in the contracting budget study, except that the first budget was $120, the second was $80, and the final budget was $40.

The authors found that consumers whose budget had shrunk significantly reduced the variety of products they chose to buy, preferring to eliminate some items altogether in order to maintain favourite items at a level they had become used to under the higher budget.

This tendency applied not only to grocery items, but to investment and travel decisions as well.

"It is vital to understand the budget contraction effect. During economic downturns, consumers with falling budgets may be tempted to move their money into a smaller number of investments, creating a more risky portfolio," the researchers noted.

The study appeared in the Journal of Marketing Research.