> The existence of credit cards is basically an automatic 2-3% inflation on prices.

If you want to draw this conclusion you’d have to calculate the cost of the alternative. What would the impact on prices be if there were no electronic payments? What would the impact on prices be if every bank had to implement its own electronic payment system with every merchant? The credit card system integrates a huge portion of the worlds merchants with nearly all of the worlds banks. It’s massively more efficient than the alternatives, apart from other conceptually similar systems that have exactly the same type of costs. Your claim that removing this efficiency would lower prices seems entirely implausible and to me.