If you're spending less money, that means that you probably have a source of income. Otherwise, you wouldn't have anything to spend.
Discussion
I didn't say "an income"--I said the income needs to "beat inflation".
You need extra money so that you can save for a rainy day. Depending that the income you currently have will be around forever, or that you will have the ability to do it forever, is just silly.
Yes, many can get to that "extra" by living frugally.