[mattmaroon]

That’s very true, but he’s had the account for 30 years and assuming that means he started it young, 50% in bonds is borderline insane. It’s a lot more likely to cost you a large amount in retirement than bail you out in your 30’s.

[Majromax]

Applying optimal portfolio theory to the long history of market returns suggests that the most risk-efficient allocation is something like 60% stocks and 40% bonds. The diversification reduces volatility faster than it reduces the overall return, so equity-like returns can be regained by using leverage on the portfolio.

Following this advice today is tricky thanks to the persistent yield inversion: you obviously can't improve returns by using short-term borrowing at 5% to invest in long-term bonds at 4%.

[mattmaroon]

Wouldn’t the most risk-efficient strategy both depend on a large number of factors and also, in any case, start off with a higher allocation of equities and move over time to a higher allocation of bonds?

The stock market has never not outperformed bonds over a 45 year period, maybe even half that, so if you’re 20 and putting 40% of your savings in an account you can’t touch until your 65, you’re kind of just chucking money down a well right?

[Majromax]

> Wouldn’t the most risk-efficient strategy both depend on a large number of factors and also, in any case, start off with a higher allocation of equities and move over time to a higher allocation of bonds?

Not really. The most risk-efficient strategy optimizes the ratio between expected return (less the risk-free rate) and volatility (standard deviation), regardless of the absolute value of those parameters.

If that optimal allocation has too much risk, such as for the near-retiree, then the investor can keep a fraction of their portfolio in the mix and the other half in cash (money market, paying the risk-free rate). If the allocation has too little risk, then the inverse applies: borrow on margin (at approximately the risk-free rate) to invest more than 100% of net assets into the mix.

[mattmaroon]

Right but a 25 yr old’s retirement account has practically zero risk. If you functionally can’t withdraw the money for decades anyway, there’s approximately zero chance a dollar invested in bonds will outperform a dollar invested in equities.

Ending up at 60/40 might be a good plan, but starting there seems a waste of money.

[throwaway2037]

I am not sure that anyone recommends that 22 year olds put 40% of their retirement portfolio in bonds! That is insanely conservative.

[Majromax]

That's where leverage comes in. Under more ordinary conditions, the 22 year-old would have something like 80% in equities and 50% in bonds, using leverage to have a net 130% invested.

Under current conditions, that allocation is more questionable. The yield inversion means that the expected value of a leveraged bond investment is about zero (borrowing at a higher short-term rate to lend at a lower long-term rate), so any portfolio gains come from anti-correlation of bond and stock prices. However, the current market worry is more about stagflation than a traditional recession, such that inflation leads to both higher interest rates and lower equity returns (through equity de-leverage).

[throwaway2037]

Where do you get the leverage and what does it cost? To be clear: Leverage isn't free. It is borrowed money -- financing -- for your positions. For most retail people, they will struggle to pay less than 5% per year, and usually much more. Here is a list of margin rates from Interactive Brokers: https://www.interactivebrokers.com/en/trading/margin-rates.p...

A never once, did I am read any sensible long-term retail strategy that recommended the use of leverage, let alone persistent leverage. This is a strange post.

What does your portfolio look like?

[SkyBelow]

Isn't the point to change as you get closer to retirement? When your investments have a decade plus to recover, leave them in aggressive investments. There is a risk that a decade+ recession might mean delaying retirement, but in that situation delaying retirement is likely the best option even if your money was in s safe investment.

Once you are close to needing some amount of money, say X a year, then you don't have time for that X to recover, so the idea is to move X into a safer investment so it won't go up or down. Any money you don't need is still in aggressive options that have time to recover. Now you need X money every year, so you decide how many years you want to sacrifice growth for safety. Maybe 5 years, maybe 10 years. Call it Y years. Simulations show the historic optimal Y, though I don't recall the exact number and some people might want to gamble depending upon how much freedom they have to change X if needed. So X*Y is roughly the amount of money that needs to be in safer investments.

This all ends up being too complicated a math equation to optimize for the average person, so percentages are given that are much easier to follow which roughly work as a solution to this equation.

Individuals should be able to come up with their own plans based on what they want. For example, if I'm heading towards an early retirement, I might leave all my money in aggressive investments because if a market downturn hits, I'm okay with working a few more years before retiring. I'm also aiming for a retirement with big X spend a year, but have plans on how to live life if I have to move down to medium X or small X. Others might be aiming for a retirement of X and won't be able to make finances work with les than X, so they have to take a much safer approach to guarantee a retirement that doesn't lead to running out of money.

[ghaff]

It really depends upon your age, your financial situation, what you want to do in terms of passing down money--and, as you suggest--if retirement means opening the money funnel on extravagant vacations... If you're comfortable with your ongoing situation with very conservative investments, that's probably what you should do. If you want to play the typical equity numbers over a reasonable timeframe, that may be a better bet. I've certainly been ratcheting down my equity, especially individual stocks, over time even if the expected value is probably lower.

[ChrisMarshallNY]

Well, what’s done is done. I was planning to bail, back in my 30’s, but changed my mind, and stayed for almost 27 years.

It still makes more than I spend, but we’ll see what the future brings.

[mattmaroon]

That’s the great thing about saving, even if you do it suboptimally, it still is a lot better than the opposite.

And in hindsight it’s almost always suboptimal.

[ghaff]

You can do insanely stupid things of course.

But saving in some remotely rational and diversified way is better than not saving at all even if some bets turn out to be better than others.