A wealth tax will affect the distribution of investments. It might make higher risk investments like stocks more attractive as compared to bonds, it might make them less attractive. More likely it might make publicly available instruments less attractive in general, as private investments have more flexibility in how they are evaluated. In any case, there will be winners and losers as the investment landscape shifts, which affects everyone. If equity becomes more attractive, it could force less wealthy people into equity, which means they will take on more risk. If private investments become more attractive, less wealthy people will lose out. It might not affect those with no assets, but that is not certain either. So, everyone will be affected, in some way. Impossible to model due to unintended side effects.