- A reductive process you apply to expenses.
- A multiplicative process you apply to assets via compounding.
Driving these processes is, first of all, will-power or the ability to delay gratification. You need to put in some mental effort to motivate yourself to save money to commit to the reduction of anything in life. Secondly, you need some open-mindedness and knowledge to multiply your money better. This requires a degree of risk-taking and trying out new stuff.
Because you seldom find a combination of willpower and open-mindedness in the same person, this is probably why so many folks fail in the self-help domain.
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