But almost every delay discounting experiment has used hypothetical money and therefore it is possible that participants did not consider saving hypothetical money and earning interest from it.
If participants of delay discounting experiments were influenced by inflation rate, it can be said they were under money illusion.
This study uses a computer game-like task to investigate the effects of interest and inflation rates on delay discounting in human behavior.
The purpose of Experiment 1 was to investigate the effect of the inflation rate on delay discounting when the nominal interest rate is constant.
None of the participants had previously taken courses in behavior analysis, and none had previously participated in experiments on delay discounting.
The curved lines represent the hyperbolic discounting functions (Equation 1), fitted to the median data of deflationary (k = 0.
These results suggest that inflation rate has an effect on the discounting of delayed rewards, although objectively, the delay discounting behavior that maximizes purchasing power is the same at any inflation rate.
Although Experiment 1 showed that inflation rate has an effect on discounting behavior, it is possible that the nominal interest rate does not affect delay discounting.
The discounting of delayed rewards will be strong as the nominal interest rate increases.
The curved lines represent hyperbolic discounting functions (Equation 1), fitted to the median data of 0% (k = 0.
These results suggest that nominal interest rate has an effect on discounting of delayed rewards.
The purpose of Experiment 3 was to investigate the effect on delay discounting of different combinations of nominal interest and inflation rates that yield the same real interest rate.