After reading 'Thinking Fast and Slow" by Daniel Kahneman, I'm not surprised people can't calculate their bill and determine change in line at the super market.

After reading 'Thinking Fast and Slow" by Daniel Kahneman, I'm not surprised people can't calculate their bill and determine change in line at the super market. Solving math problems like that requires deliberate focus and effort. Nobody has the time or energy to do that on line at the supermarket. Most probably estimate.