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After working for a major international brokerage firm, along with my own private asset management company, for nearly 20 years, I’ve seen it all when it comes to money management. From family feuds over inheritances to middle-class families being able to afford college for their kids, the profession offered me a front-row seat to the highs and lows of personal finance.

But through all the ups and downs, a few immutable truths revealed themselves time and time again. Here are the most important lessons I’ve garnered from my nearly two decades in the industry.

Don’t Let Your Emotions Lead You Astray

As Michael Douglas’s character Gordon Gekko famously says in the movie “Wall Street,” “Don’t get emotional about stock, it clouds your judgement.” While coming from a fictional character, the sentiment is spot-on. Fear and greed are the two most dominant emotions when it comes to investing in the stock market, and unfortunately, each one seems to pop up at the exact right time to encourage bad decisions. 

When markets scream higher, investors get euphoric. Conversely, when markets sell off sharply, investors get fearful, sometimes to the point of panic. These dual scenarios lead to situations in which investors buy high and sell low, when they should be doing the exact opposite. In the words of billionaire CEO Warren Buffett, investors should “be greedy when others are fearful, and fearful when others are greedy.” Don’t let your emotions twist this around and lead you to doing the opposite.

Your Most Important Financial Obligation Is Saving

When asked which financial obligation is the most important, many clients will list mortgage/rent, food and household bills like utilities as essential. And while it’s true that all of these bills must be paid, if you prioritize them ahead of your savings, you’ll likely find that you end every month without any money at all to invest.

This is where the famous mantra “pay yourself first” comes into play. By setting aside money for your savings and investments before you pay any bills — via automated transfers, of course — you force yourself to live beneath your means. If you find yourself coming up short in terms of paying your monthly expenses, it means it’s time to trim your costs, not reduce your savings. 

Draft a Clear, Unassailable Estate Plan

One of the saddest parts of being a financial advisor is watching how families tear themselves apart fighting for “their share” of an inheritance. Many of these family disputes can be nipped in the bud by drafting a clearly worded estate plan and sharing it with family members ahead of time. When your explicit wishes are mapped in advance and disclosed to all of your beneficiaries, you greatly reduce the chance of in-fighting among family members after your passing.

You’re Not Likely To Beat the Stock Market

Let’s be blunt — the average investor doesn’t do a very good job at outperforming the stock market. But there’s no shame in that; most professional money managers don’t consistently beat the S&P 500 over time either. With that in mind, it makes a lot of sense to avoid active trading. Not only are you likely to come up short versus the overall market, day trading also requires extensive time and effort, and any gains you achieve are taxed at higher, short-term capital gains rates. 

Keep Things Simple

All things considered, the best single investment for generating long-term wealth may be a simple S&P 500 index fund. Not only does this “guarantee” a near-market return, it’s simple, easy and cost-effective.

Diversification is certainly an option, but be wary of high-cost, complex investments that promise market-beating returns, as they typically come up short. Even Warren Buffett has often said that “a low-cost index fund is the most sensible equity investment for the great majority of investors.” After he passes, Buffett has instructed the trustee of his estate to place 90% of his assets into an S&P 500 index fund, so he’s putting his own personal money where his mouth is. 

Compound Interest Is a Miracle — but You’ve Got To Be Patient

The saying that compound interest is the “eight wonder of the world” is often attributed to legendary genius Albert Einstein. But regardless of the true origin of the expression, the sentiment is accurate. If you invest $100,000 at a 6% rate of return, collecting your interest every year, you’ll end up with $220,000 after 20 years — $120,000 in income plus your original $100,000 investment. But if you instead reinvest that money every year, so that you earn interest upon interest, you’ll end up with closer to $331,000. That’s an additional $111,000, or more than 50% more. 

While some investors understand the power of compounding, many do not realize that you have to be patient to truly reap its benefits. As your compounded balance increases, your returns accelerate. In the above example, if you stopped compounding after 10 years, you’d only earn approximately $82,000. The additional $149,000 is earned in the ensuing 10 years.