Based on the retail sales data that came out yesterday, it’s time to take a serious look at the prospect that U.S. economic growth is slowing down.

I’m not suggesting that we’re moving back into a recession—just that growth is quite possibly slowing below expectations, and an acceleration may not be coming any time soon. We need to consider why that might be.

Every year or so, I do a postmortem of my analyses and predictions in order to figure out where I was wrong, and how to avoid making those mistakes in the future—a useful, albeit uncomfortable, exercise. One of the biggest mistakes I’ve made in the past decade has been to underestimate the power of governments to influence markets.

A major demographic transition is under way in the U.S., with the baby boom generation aging into retirement as the millennials (or echo boomers) start to enter their prime earning and spending years. This is a well-known story, but lately I’ve been thinking about a worrying new take on it.

Today, I want to revisit a post I wrote just over two years ago. I’ve updated some of the data, but the concerns and the conclusions remain timely. In keeping with one of my recurring themes, this is also an example of how rising interest rates won’t mark the end of the world but, rather, a return to a more normal environment.

I closed yesterday’s post with the thought that, based on positive U.S. economic trends, we should now be planning for the problems of success. Sure enough, the economic data released yesterday highlighted a big one: inflation, with the monthly increase in the Consumer Price Index topping 0.4 percent.

Both Greece and yesterday’s Federal Reserve meeting are in the news today, but nothing particularly new or significant is happening in either case. The Fed will or won’t raise rates in September, and Greece will or won’t default at the end of the month. There’s not much else to discuss right now.

Instead, let’s raise our eyes a bit and look at the big picture. The ongoing narrative about the U.S. economy is that it continues to struggle, and the future is uncertain. I’m becoming increasingly dissatisfied with that view, as it doesn’t capture the good news and trends we’re now seeing.

I started this blog three years ago today, on June 10, 2012. At a guess, I’ve written almost 800 posts, including links to media appearances and monthly videos. That’s about 400,000–500,000 words on the economy, the markets, and, of course, lobster rolls.

My focus on this blog, as you know, is the economy and investing—with the exception of my lobster roll posts (which will resume this summer).

Although there are still big problems out there (Greece, anyone?), the U.S. economy continues its slow expansion, and economics is no longer the concern that it was. The same, generally speaking, applies to investing. Despite many potential pitfalls, which I’ve discussed in detail, the market appears more likely to head up than down, at least for the moment.

“In Flanders fields the poppies blow / Between the crosses, row on row . . .” — John McCrae

I was in London late last year and had the chance to see the poppy exhibition at the Tower of London. A red ceramic poppy stood for every one of 888,246 soldiers of the British Commonwealth who died in World War I, filling the fields around the Tower.

I’ve been away speaking at Commonwealth conferences for the past 10 days, which were (as usual) a tremendous amount of fun. I even had the chance to take my parents to the last one, in Naples, Florida. They found—and I rediscovered—that there’s no nicer group of people than Commonwealth advisors and staff. I’m tremendously grateful for the opportunity to hang out with these folks, and to show my parents my world.