This is what happens when you have gigantic amounts of cheap money sloshing around (companies buyback stocks for quick profits instead of investing in the future) and forced, government pay rises which mean higher costs for a set amount of production (among other reasons).
Or, not.
Cheap money doesn't suppress productivity. In fact, it could potentially enhance it, as it makes it easier and cheaper to invest in new technologies that enhance productivity. This can range from lending to startups, to helping corporations purchase new equipment that increases productivity.
In practice, of course, corporations
aren't doing that; capital spending has slowed. That is one reason productivity growth is slowing (and is still not linked to low interest rates or cheap credit).
It's more likely that the great wave of productivity-enhancing technology has largely matured, thus resulting in lower productivity gains. We've spent about 20 years throwing new technology at everything, and expecting it to never end is slightly ridiculous.
And anyone who thinks this is not a big deal - if it continues, and it probably will (overall) for the foreseeable future - simply does not understand what it means.
And yet, you don't actually bother to explain what it means? Seems odd.
I don't see a terribly strong correlation between productivity growth rates, and GDP growth rates, in the US since 1950.
Usually, we assume that productivity growth rates are linked with and/or correlated to wage growth. However, it's pretty obvious that since the 1970s, wage growth has not been equally distributed -- very possibly due to the ways that productivity has grown. E.g. when you replace 19 workers with automation, that 1 remaining worker will have significantly higher productivity, but certainly won't get all the wages of those 19 fired workers.
So tell us, what does a potential flattening of productivity growth portend?