How is the cantillon effect supposed to cause an exponentially and constantly increasing inequality? If I take you at your word inequality would be constant and never increase.

Also, proponents of the cantillon effect forget that people with money can do an inverse cantillon effect by withholding their money from the markets and then they can do a regular cantillon effect by putting their money on the market.

If we assume a positive return on capital aka a positive interest rate then inequality would rise simply because the wealthy have most of their consumption needs fulfilled already and then in the late stages of capitalism they would be the ones manipulating the cantillon effect because they act as a quasi central bank.