Lucid Motors is a penny stock again, at least by the loose definition most of us use for anything trading under $5. 24/7 Wall St. covered the milestone this week, and it's worth a few minutes of your attention, though maybe not for the reason you'd expect.

A stock under $5 doesn't tell you a company is finished. What it usually tells you is that the market has stopped pricing in a rescue. For an EV maker burning cash quarter after quarter, the share price is less a verdict on the cars and more a running tally of how much longer the money lasts. When that price slides under $5, the tally is getting short.

I've watched this movie since the late '80s, and the plot rarely changes. A young company with a genuine product raises enormous sums, promises scale just around the corner, then dilutes shareholders over and over to bridge the gap between the dream and the income statement. Lucid has been through multiple capital raises, and each one hands existing owners a smaller slice of the same pie. The quiet tax nobody mentions at the launch events.

The math that matters here is simple. If a company issues 30 percent more shares to raise operating cash, your stake shrinks by roughly 23 percent even if the business itself is worth exactly the same. Do that a few times while the stock also falls, and a $60 stock from a few years ago becomes a $4 stock without a single surprise. Just arithmetic, grinding away.

None of this means Lucid's cars are bad. By most accounts they're well engineered, and the people building them clearly believe in the work. But a good product and a good investment are two different things, and confusing them is one of the most expensive mistakes a new investor can make. I did it myself once, three decades ago, with a company whose product I loved and whose stock I rode all the way down. The product was fine. My money wasn't.

So what do you do with this? Probably nothing. If you own Lucid as a small speculative position, you already knew it was a bet and not a plan. If you don't own it, the sub-$5 price is not a discount sign flashing in a shop window. Cheap and undervalued are different words for a reason.

If anything, let it be a reminder about position sizing. The money you put into any single struggling company should be money you could watch go to zero without changing how you sleep, or how you retire. When was the last time you actually checked whether that's true of your own portfolio?

The boring strategy, the one with the index fund and the automatic contributions, doesn't generate headlines. It also doesn't generate reverse splits.

As always, this is my perspective and not professional financial advice. Talk to a real advisor before making decisions with your money.