In Mexico's case, most of the potential tax base in the wealthier half of the country is underground or offshore, both of which are pains in the ass. Evading taxes is hard work. Reducing the burden of compliance vis-a-vis noncompliance will bring a lot of that into the system - that in itself would be enough to offset revenue loss within about 4-5 years, and growth resulting from a larger pool of available capital would be icing on the cake. The tax system is the biggest fundamental obstacle to economic growth here.
In the US, the issues are different, but in general (not counting specific cases of focused targeting of tax revenue a la MITI in Japan, to create bubble growth
), high rates of taxation are not conducive to expanding your tax bases. The problem is that the time scales for growth and revenue loss are different, and there's a lot of other intervening factors that will influence the rate of growth.
In the US, the issues are different, but in general (not counting specific cases of focused targeting of tax revenue a la MITI in Japan, to create bubble growth

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