Let us go back in time in the production process and ask ourselves where the consumer goods came from in the first place. St. Thomas Aquinas pointed out that what is first in intention is last in execution. In economics, this means that the desire to have and provide a consumer good is the last stage of a process that brings into existence resources that were not necessarily related before. These “higher level” goods include things like taking iron ore out of the ground, which no one would do just because they were bored, but they would do if they were paid for doing it, because the ultimate goal of the ore is the frame of an automobile, or some such consumer good. It includes transportation, factories, machinery engineers, machinists, and on and on.
If a nation spent all its money on consumer goods today, what would they have left for tomorrow? Nothing. This means that in order to have consumer goods in the future, we have to have capital goods, goods used to produce consumer goods in the future, today. The capital goods are those mentioned in the last paragraph. On the face of it, money must be spent just to keep the current stock of capital goods functioning at current levels, providing the same amount and quality of consumer goods coming tomorrow as we had today. That means something has to pay for the wear and tear of the equipment, and replacement when something is no longer functional. This is called depreciation and purchase of new equipment to replace the old. This also applies to people. Workers retire, die, move to other jobs, need retraining, etc. It costs money to replace and train workers, and this must be done all up the line, back to the iron mine. Where does this money come from, consumption? Well, certainly companies use most of their profits, if they have had any, to do all this equipment maintenance and personnel replacement. That is corporate savings. But frequently, the company has to go to the capital markets, i.e., the stock and bond markets, and banks, for money for this purpose. Where does this money come from? Our SAVINGS!
When you save money in a commercial bank, or put money in corporate bonds, you make that money available for companies to borrow. When you buy stocks, a company can get money from an investment bank based on the current price of their stock, which will form the basis for an initial purchase option, where the bank will give (not lend) the company money based on the probable price they will get offering new stock on the market. So this all comes from savings—your savings and mine. No savings—no replacement of aging equipment and personnel.