Well an argument you could make is taxing investments makes people less likely to save. Our GDP is basically all comprised of consumption so if a person substit

Well an argument you could make is taxing investments makes people less likely to save. Our GDP is basically all comprised of consumption so if a person substituted a consumption good over an investment good could cause a decrease in growth, or cause them to invest in something outside of traditionally taxed investments. No such thing as a perfect way to tax people. Not really for or against more capital gains taxes.