Canadian governments have talked about indexing capital gains to inflation since 1972 when capital gains first became taxable. As soon as they run the math on the cost in lost taxes they back off.Also, since there's been talk about indexing capital gains to inflation, let's do it -- BUT then treat the gains as ordinary income.
It's exactly the same with interest income. Back in the 1970's I was making 15% interest on Canada Savings Bonds but only about two percent of that was real income, the rest was just inflation. But I was taxed on the total interest.
Capital gains became taxable in Canada as a result of the Carter Commission report;
https://www.thecanadianencyclopedia.ca/ ... n-taxation
Carter also believed that capital gains should be taxed at 100% but that was a step too far for the government of the time and no subsequent government has taken the political risk of implimenting it.
Another sweet spot for the government is inflationary wage increases. My wages more than doubled in the 1970's but most of that was the result of the crazy inflation of the times. Since prices also doubled my actual real financial benefit from the increases was essentially marginal. However, thanks to the government having tax brackets with higher gradated rates based on income levels I paid significantly more than double the taxes at the end of the decade than I did at the start.
Governments love inflation (within limits) because it increases the real percentage of income collected through taxes without the government doing anything but maintaining the system.