Even simpler, it is an equation with three variables: income, expenses, and rate of return on savings. An important point is that you do not need to hyper-optimize all three variables to achieve a good outcome, which makes it adaptable to many lifestyles and circumstances. Hyper-frugality is not the only path. There are multiple viable strategies that can be built around optimizing one or two variables and paying minimal attention to the others.
Frugality (minimizing expenses) is the easiest strategy to execute and it covers the broadest range of individual situations.
I know some engineers that take the approach of aggressively maximizing income, which requires a different kind of investment/sacrifice, allowing them to achieve their goals without hyper-optimizing expenses or rate of return. I would make the observation that this strategy tends to take a human toll, so not for everyone.
The rarest strategy in the wild, because it is the most technical to execute, is hyper-optimizing rate of return. I only know a couple examples of this, including one who went from -$50k (debt with no assets) to financial independence in ten years (and handily beat the S&P500 every single year) on a modest engineer's salary. This requires a deep investment in understanding a foreign domain almost no one is familiar with and achieving a degree of mastery. It has the highest payoff long-term but it also requires the most diligence and effort upfront. Making this work requires an unusual kind of person.
Being frugal and investing in index funds is definitely the path of least resistance for many people, but many people (or their partners!) do not want to live a hyper-frugal lifestyle. Fortunately, there are other options available with their own set of tradeoffs and engineers are well-positioned to take advantage of them.
As an investing noob, most of my money is parked in low interest savings accounts. How much of my life savings should I park in index funds? Any smart investing resources/guides you recommend? Thanks for your time.
6 months of living expenses in liquid cash (savings accounts, rotating CD ladder, money-market funds, etc.).
Any money that you'll need in the next 5 years in low-risk, non-volatile investments (eg. bonds, T-bills). This usually applies to retirees, but also to folks like entrepreneurs or commission salespeople that have unsteady incomes.
Only invest in real-estate, individual stocks, crypto, precious metals, foreign currencies, collectibles, etc. if you know what you're doing. If it's not your full-time job (eg. a venture capitalist or real estate developer), no more than 10% of your net worth in these investments.
Frugality (minimizing expenses) is the easiest strategy to execute and it covers the broadest range of individual situations.
I know some engineers that take the approach of aggressively maximizing income, which requires a different kind of investment/sacrifice, allowing them to achieve their goals without hyper-optimizing expenses or rate of return. I would make the observation that this strategy tends to take a human toll, so not for everyone.
The rarest strategy in the wild, because it is the most technical to execute, is hyper-optimizing rate of return. I only know a couple examples of this, including one who went from -$50k (debt with no assets) to financial independence in ten years (and handily beat the S&P500 every single year) on a modest engineer's salary. This requires a deep investment in understanding a foreign domain almost no one is familiar with and achieving a degree of mastery. It has the highest payoff long-term but it also requires the most diligence and effort upfront. Making this work requires an unusual kind of person.
Being frugal and investing in index funds is definitely the path of least resistance for many people, but many people (or their partners!) do not want to live a hyper-frugal lifestyle. Fortunately, there are other options available with their own set of tradeoffs and engineers are well-positioned to take advantage of them.