There's this question that doesn't let me sleep at night...

From what I hear, investing surplus money is always considered a good idea because it lets your money "work for you" and earn you more money, even while you do nothing (well, assuming you've made a thoughtful investment and don't just lose your money).

There are various ways to do this, but at the end of the day they are just a variation of the same theme: you buy some object O for X money and then rent it out to people for Y money per month (or week or year or whatever). Y is a fraction of X, but over time it amounts to way, way more than X. X can be anything from cars and boats to real estate and even money itself (aka lending). Companies are a special case of this where the owner rents the company to their employees. The rules are twisted here to be in favor of the employees (instead of a fixed Y they pay whatever surplus they produce; and if they don't produce a surplus then the owner has to pay THEM), but if a company is making a profit, that's essentially what happens anyway.

And the great deal about it is that you, the owner of the object, don't need to lift a single finger. You don't put in ANY work at all, you just rake in the cash. And then with the new cash you can then buy more O's and make money even faster and so on until infinity. Wealth this way expands exponentially, or at least it does until some real life misfortune happens to slow it down for a while.

But here's the problem with this that I cannot get over:

This means that the "owners" are like vacuums for money. There's a fixed amount of money in the system and they just keep getting more and more of it. Eventually, if nothing is done about it, you should end up with a few elite owners that own ALL the money, and vast masses of people who own absolutely nothing, because they've had to spend their last dollars to pay their rent payments.

The government can, of course, print more money, but that leads to inflation and we don't do that much anyway. You can tax the rich people and give a part of their income back to the poor, but that just slows things down.

So... why are capitalist economies thriving and average non-investing people keep getting better lives (and more purchasing power), when theoretically the opposite should happen?

  • $\begingroup$ Actually, we have recently seen a lot of people complaining about this effect. $\endgroup$ Commented Feb 24, 2020 at 12:56

2 Answers 2


First of all there are several incorrect statements in your text:

  1. Investing money is not just raking in the cash. It involves a risk, actually non trivial part of the reason why you earn interest on money you invest is the compensation for you taking this risk. If you consistently take bad risks you eventually lose your money, so its not correct to say investing is just like "rake in the cash". Moreover, if you invest in your own business/projects you have to put entrepreneurial work in. The only portion of the return that you could consider as "raking in cash" is the portion that you get to compensate you for opportunity cost of not investing the cash but enjoying it.
  2. There is no economic theory that says in capitalism lives should get worse. In fact in economics we dont even use term capitalism - but assuming you mean by capitalism mixed but predominantly market based economies there are no economic theories which says life should get worse in those. Note in science we usually use theory differently from common English. A theory must be some consistent and testable explanation of some mechanism, and often we reserve the word theory only to consistent explanations that were already successfully tested and supported by evidence.
  3. Money in economy circulates. Unless the rich investor stuffs the money under a mattress, it is incorrect to compare her or him to vacuum cleaner. If you put your money in bank it will get lend out to people who need it. If you spend your money on high living then again the money is paid to producers of the stuff you enjoy.

  4. You cannot invest any number of money you want and expect the same return. Ultimately you will experience diminishing marginal returns on your investment. As the supply of savings increases interest rate goes down as in a present situation when in some countries interest rate is even negative, so you get punished by saving and rewarded by borrowing money.

Now to answer your main question, why the economy does not run out of money (assuming no more printing of new money), it is because prices in economy adjust. Generally, the monetary part of macroeconomic can be described by classical monetarist equation which states that:


Where M is the money supply, V velocity of money, P price level (change in which will give you inflation/deflation), and Y is the real output - how much goods and services economy can produce.

Now lets assume that money supply is fixed (hence no more printing of additional money), and examine the effect of investment on this relation. First, real output actually depends on level of investment. The higher level of investment, the higher number of factories and capital workers can work with so also the higher output we get. So investment increases the real output Y. Real output is also actually what determines the well being of people within a country (at least as measured by lets say GDP per capita). However, to keep the equation balanced something else has to change. One possibility would be for velocity of money to increase- i.e. the speed in which money circulate, but velocity of money usually does not change much. So most likely what will actually happen will be that aggregate prices P decrease, meaning that for the same amount of money you will be able to buy more goods and services.

Lets also for a second suppose that rich would actually stuff all their money in the mattress and never used them in any way possible. This would just be equivalent of actually decreasing money supply M and again P or V would adjust. In the short run decline in money supply could also negatively affect Y, but in the long run output Y is fully determined by the production capabilities of economy not by number of dollar bills circulating.

So in either case sustained increase in material welfare is possible. Also, note redistribution is not actually about taking the money from rich and give them to poor its ultimately about transferring the resources from one to another. So redistribution also does not actually necessarily depend on availability of money in the economy (although thats a topic of its own that I wont go into).

So to sum it up, some of the premises in your question are not correct, and the answer why you can have a sustained increase in wellfare when money stock declines is that prices (or potentially also partially velocity) adjust. The total output and hence material welfare of country is (in the long run) independent on quantity of money.

  • 1
    $\begingroup$ But even if the rich people invest their money, they still own it! OK, now in the form of a property, but it's still theirs. They haven't lost any money. Their net worth never goes down. They just keep getting more and more wealth. And the speed at which they acquire wealth also keeps ever increasing (unless they really pull an Uncle Scrooge and build a money bin). How do they not leave everyone in the dust? How can there be anything left? $\endgroup$
    – Vilx-
    Commented Feb 20, 2020 at 14:49
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    $\begingroup$ @Vilx Money is not equal equal to property. If you buy property your stock of money declines and stock of owned property increases. Your question was about money not wealth - wealth. Second because of declining marginal return and increasing marginal costs on any activity it is not possible to accumulate more wealth/stuff at increasing rate in the long run. The more you buy property the more expensive it becomes because if the supply of property is fixed then increase in demand will lead to higher price. Anyway money has not much to do with wealth in economics so here we are getting off topic $\endgroup$
    – 1muflon1
    Commented Feb 20, 2020 at 14:58
  • $\begingroup$ OK... this is all just making me more confused. I'll have to think about it. Thanks for now! $\endgroup$
    – Vilx-
    Commented Feb 20, 2020 at 15:02
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    $\begingroup$ "there are no economic theories which says life should get worse" Didn't that Marx guy write something about this? $\endgroup$
    – Giskard
    Commented Feb 20, 2020 at 19:09
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    $\begingroup$ @Giskard but famously Marx never solved his own model so it does not qualify. Also as far as I know nobody did completed it as the Marxian-Sraffarian tradition is thought to be dead end. Scientific theory should be some consistent and testable explanation. Furthermore, usually in science we apply the word to explanation that was already successfully tested in past and I don’t know of any part of Marx works that would be treated kindly by empirical evidence. Sure if you are liberal with the word and call any explanation theory then it might qualify but then any thought would... $\endgroup$
    – 1muflon1
    Commented Feb 20, 2020 at 19:26

What you're ignoring is how the owner obtains object O for X money. X represents savings (either by the owner themselves or by a third party from whom the owner borrows from). So somewhere in the past before you even get to owner becoming a "vacuum of money" an actor in the economy has to under-consume so that savings could accumulate. The concept of "never lifting a finger" is incorrect because the owner has to tap in to savings which represents their own time and labor. They then have to not only save but then take the risk to buy the asset which could later turn out to be a wrong decision.

Secondly owning assets (which I'm assuming you are universally referring to as O) is not a frictionless yielding investment. All assets depreciate to certain extent. For example, owning real estate requires maintenance and down-time between leases. Sure, you can certainly average out the yield and come up with a certain number but there is still debt that needs to be serviced until it's completely paid off.

Regardless, after the owner has saved their money and then risk those savings, also known as capital, in the form of owning an asset, they have to pay off the costs of ownership in the form of maintenance or paying employees (who by the way take no risk because they are guaranteed a wage for as long as the business is viable) before making a profit. The profit is a signal that the owner (now entrepreneur) is adding value to the economy. The profit margin is what rewards the owner for saving and taking a risk. However, there's a natural limit to margins because large margins will attract competitors and therefore place that ceiling in the long run.

If you can now imagine one owner in one particular industry, try to now aggregate that concept across the economy and then as more value is being created, supply is increasing which drives down prices. The fact that the so-called "owners" suck up all the money from their profits is immaterial. Money is simply claims to wealth. If all they do is horde it and look at it, it simply creates deflation for everyone else and prices fall which benefits everyone else.

  • $\begingroup$ "If all they do is horde it and look at it, it simply creates deflation for everyone else and prices fall which benefits everyone else." - On the other hand, what if they spent it all on a vital but limited resource? (let's say fresh water) On the third hand, why would they do that? $\endgroup$ Commented Feb 24, 2020 at 12:58
  • $\begingroup$ If, for example, a valuable or essential commodity was all bought up like your example of fresh water, there would be some limit that could be done by the so-called rich because fresh water doesn't stay good indefinitely and couldn't be consumed fast enough before 90% of it goes bad. $\endgroup$
    – Queue Mann
    Commented Feb 25, 2020 at 14:52
  • $\begingroup$ I think water might be a bad example, but maybe I am getting at the fundamental concern here: money is a claim to power. (you can tell people what to do). Wealth is things like houses and fancy cars. Money is not a claim to those. Money is, however, the power to make people those for you. The concern: if money concentrates, then there can be a point where it fails to accurately represent power. One day you pay people to do something wildly unpopular, and instead of doing it, they declare your currency worthless, burn it and come at you with pitchforks. $\endgroup$ Commented Feb 25, 2020 at 16:21
  • $\begingroup$ I'll have to respectfully disagree with you on what money is. Money is a medium of exchange and when not spent is a future claim to a good or service through voluntary interaction. No one can be coerced to provide a good or service. Therefore, I cannot agree with the rest of your argument since we disagree on the definition on money and power. If we cannot agree on the definitions, consider this a closed discussion. $\endgroup$
    – Queue Mann
    Commented Feb 25, 2020 at 17:12
  • $\begingroup$ And if money concentrates in the hands of a few people, one day it will be useless for that purpose because it's not where it needs to be to be useful. $\endgroup$ Commented Feb 25, 2020 at 17:27

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