Why Dave Ramsey Chooses $5,000 Index Funds Over SpaceX: The Math Explained

On the June 12 episode of The Ramsey Show, a debt-free single woman with a roughly $250,000 net worth called in asking whether to buy 10 to 100 shares of SpaceX at about $162 each because a friend told her the stock was “going to skyrocket.” Dave Ramsey’s answer doubled as a personal finance lesson for anyone tempted by a hot single-stock tip: “I am not investing in SpaceX. I’m not buying single stock in that company. As much as I’m rooting for it, I could just keep doing what I’m doing, invest in mutual funds and stay boring.”

One housekeeping note before the math: SpaceX is not listed on a U.S. exchange, so most retail investors cannot simply buy shares the way the caller described. The closest public-market proxy is Elon Musk’s other company, Tesla (NASDAQ:TSLA | TSLA Price Prediction), which recently made a $2 billion equity investment in SpaceX and is building a chip fab at Gigafactory Texas with SpaceX.

The verdict: Ramsey is right, and the math is the reason

Ramsey’s position is correct for the caller, and the case rests on opportunity cost. He framed it plainly: the claim behind any single-stock bet is that it will so badly beat the broad market that locking up the money is worth the risk. He reminded the caller that the U.S. market has roughly doubled every seven years, meaning a $5,000 index purchase has historically tended to become about $10,000 over that span without anyone touching it.

Real numbers back up the “boring” path. The SPDR S&P 500 ETF Trust (NYSEARCA:SPY) is up 23% over the past year, 75% over five years, and 257% over ten years. It does that work for a 0.09% expense ratio, holding 500 companies across eleven sectors. The fund’s top ten names, including NVIDIA at 8% and Tesla at 2%, already capture the AI and electrification story most retail investors are chasing.

If you want more growth tilt, the Invesco QQQ Trust (NASDAQ:QQQ) returned 35% over the past year and 568% over ten years. Co-host George Kamel’s point lands here: a good growth-stock mutual fund will absorb SpaceX over time once it goes public, so patient investors get a piece anyway without taking single-stock risk today.

The variable that actually decides this: your play-money cushion

What actually changes the answer is how big the bet is relative to everything else — not age or income, but cushion size. Ramsey ran his “kitchen table test”: imagine putting the $5,000 on the table and watching it burn. Would you still be okay? She said yes, and Ramsey allowed it “could be a fun ride for you.” Kamel drew the line at the cushion size: he wouldn’t stop someone with a $1 million-plus net worth and 20 years of mutual fund investing from playing with $5,000, but told this caller “I think you’re still building.”

Both hosts capped speculative single-stock positions at 5% to 10% of a total portfolio. On $250,000, that ceiling is roughly $12,500 to $25,000 total across every speculative bet combined, not per stock. A $5,000 SpaceX position would fit inside that band, but only if no other lottery tickets are already in the account. Ramsey also referenced the Dogecoin run-up around Elon Musk’s SNL appearance as the cautionary version of this story.

The Tesla example shows why concentration is dangerous even when the company succeeds. Tesla trades at 402 times earnings and 245 times free cash flow, with a 4% net margin and 5% return on equity. The stock is down 10% year to date even after a 27% one-year gain. Single names move like that. Index funds rarely do.

What to actually do this week

1. Add up every speculative position you already own (crypto, single stocks, options) and divide by your total invested assets. If that number is above 10%, do not add SpaceX, Tesla, or any other single name until the ratio comes down.
2. Run Ramsey’s kitchen table test on the exact dollar figure you are considering. If burning it would force you to change your retirement date, the bet is too big.
3. Compare the expected hold period against a plain index alternative. $5,000 doubling to roughly $10,000 in seven years in an S&P 500 fund is the hurdle any single stock has to beat after taxes.
4. If SpaceX eventually IPOs, check whether your existing growth fund already holds it before buying separately. As Kamel noted, the fund will likely do that work for you.

The boring portfolio is boring because it works. A speculative single stock is allowed to be in the picture only after the boring part is doing the heavy lifting.