Just stumbled upon this fascinating old theory that's been circulating in trading circles lately. Back in 1875, this guy Samuel Benner mapped out what he believed were repeating financial cycles, and honestly, the pattern is worth understanding even if you don't take it as gospel.

Here's the core idea: markets basically move through three distinct periods when to make money—or more accurately, periods when NOT to lose it. The first type is panic years, roughly every 18-20 years, where financial crises and market collapses hit hard. Think 1927, 1945, 1965, 1981, 1999, 2019, and if this holds, 2035 down the line. During these periods, the advice is simple: don't panic sell. Just sit tight and avoid making emotional decisions.

Then you've got boom years—the golden periods when prices are surging and recovery is in full swing. These are technically your windows to sell and lock in profits. Markets are riding high, and it's psychologically easier to exit positions when everything feels good. The theory maps these out across different decades, and yeah, some of them actually align with real market rallies we've seen.

The third type is the recession and decline phase. Prices are depressed, growth is stalling, but here's the thing: this is actually when smart money moves. If you can stomach the volatility and have cash, these periods when to make money long-term really start to matter. You're buying assets at discount prices, then holding until the boom cycle returns and valuations spike again.

The whole thesis basically boils down to this: buy low during recessions, hold through panic, sell high during booms. Simple in theory, brutal in execution because it requires discipline and patience.

Now, real talk—this isn't some immutable law of the universe. Markets today are way more complex than they were 150 years ago. Geopolitics, tech disruption, policy decisions, wars, pandemics—all of these throw curveballs that Benner couldn't have predicted. But as a long-term framework for understanding market rhythms? It's actually pretty useful. Gives you a mental model for thinking about where we might be in the cycle and what kind of behavior makes sense.

Worth keeping in the back of your mind, especially when markets are doing something wild and everyone's losing their minds on social media.