Answer:
there was inflation
Explanation:
Inflation may be defined as the rise in the price or the increase in the cost of a product or commodities in the market. It is when you pay more price for the same commodity that you have bought it in a less price earlier.
When there is inflation, the price of goods in the market increases.
In the context, Barbara usually buys the same market basket every week at a price of $ 60. But this week she could not buy the market basket even though she had $ 60 with her. This is because the price of the market basket increased this week due to inflation and now cost more than $60. So Barbara could not buy the market basket.