Not that much. For an average rich person, most of their assets are not spend for living/luxury, and they can't realistically be unless said rich are extremely extravagant.

So, unless they are actively invested in some sort of productive scheme, they are just sitting there (e.g. as huge estates, savings etc.).

In any case, it's much better for the economy to have a large middle class, than the equivalent money in fewer rich persons.