The economy's in a slump — 6.5% unemployment. The central bank can print money to stimulate it. The catch is that unemployment isn't one thing — it's three, stacked. Printing can only reach one of them. Drag and watch which.
The takeaway will appear here once you've discovered it — keep going.
A simplified model: cyclical unemployment closes with stimulus up to “full employment” (the natural rate / NAIRU); the frictional + structural remainder is the floor, lowered only by real reform, not money; printing past the floor spills into inflation (a wage-price spiral). Real numbers move around and the natural rate itself drifts — but this is genuinely why money can cure some unemployment and not the rest.