Doesn't this more or less imply that you have to save and invest in order to take part in economic growth? I agree that this is a problem which should be attack

Doesn't this more or less imply that you have to save and invest in order to take part in economic growth? I agree that this is a problem which should be attacked with political means, but that doesn't mean it is impossible for someone to live within their means and save. Obviously this doesn't apply to every demographic group in the world, but a large amount of people can get an account with a cheap online stockbroker and buy ETFs with the surplus of their paycheck.