The fallacy of sales tax

The fallacy of sales tax is in that it is a flat tax.  The rich and the poor get the same rate.  If it the same for all of us, it is not fair.  Think of a case like this:

An average worker thinking of doing a grocery shopping.  His budget is $50.  If the sales tax is 10%, then the amount that he can use is $45.  Instead of $50, he must manage his shopping at $45.  What can $5 buy? A loaf of bread, and milk?

An exceptionally rich person thinking of going for lunch.  His budget is $100.  If the sales tax is 10%, then he still can use $90.  What can $90 buy?  He must and perhaps can manage his lunch at $90.

Think of the above situation and think of charging the $100 lunch person a little more -- $5.  His budget is going to be $85.  Instead of $100 lunch, his lunch is going to be $85.  By that, the $50 grocery person can buy a loaf of bread and milk.

A flat tax is unfair tax.  What of a case with the person shops at $5000 level, and thinking $4500, or $4495 shopping instead.  Just by making it $4495 instead $4500, the $50 grocery shopping person can buy a loaf of bread and a carton of milk.

The equal rate is not equal.  The same rate does not mean the same.  The flat tax is good for the rich and not for the poor.