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Leading up to the Federal government's 2017 budget, there was speculation about an increase in the tax on capital gains. The current tax exemption is disproportionately beneficial to the wealthy, and it has little in the way of general economic benefits. Only half the value of capital gains is currently taxed.
The rich have gotten richer, but the poor have gotten richer too. Wages have not stagnated. The decline of the middle class that you might have heard about is not due to people earning less and so becoming lower class. The middle class has shrunk because more of us are earning an upper class income.