No need for a global system in taxes to reduce wealth disparity. Just need to stop subsidising speculation. Due to agency costs (information asymmetry etc.) it'

No need for a global system in taxes to reduce wealth disparity. Just need to stop subsidising speculation. Due to agency costs (information asymmetry etc.) it's harder to make large returns on large amounts so the wealth levels off. The problem with a global system in taxes is that the taxes will just be used to subsidise more speculation.