Investment requires returns, which mean people have to consume the resulting product, be it goods or services.
Yes, one can't exist without the other, but economically speaking, it's impossible to consume your way to prosperity. You must increase productivity, and this is done through investment.
We tried consuming our way to prosperity during the housing bubble in the early 2000s. That turned out how you might expect.
And small investments tend to have better returns.
Buying booze and drinking it isn't an investment.
No, but starting a small business is.
Everyone can start a small business right now, what's your point?