Tomas increased his consumption of potato chips when the price of pistachios increased. for tomas, potato chips and pistachios are

 For Tomas, potato chips and pistachios are substitutes in consumption. In financial matters, the consumption function portrays a connection amongst utilization and extra cash. The idea is accepted to have been brought into full-scale financial aspects by John Maynard Keynes in 1936, who utilized it to build up the thought of an administration spending multiplier.

Ithink it is a i’m not for sure

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