What explains the decades-long decline in global real interest rates?
Core argument: Global long-term real interest rates fell roughly 450 bps over the past 30 years, with lower trend growth expectations (100 bps), demographics (90 bps), within-country inequality (45 bps), and post-Asian-crisis emerging market government saving (25 bps) among the drivers.
Over the past 30 years, global long-term real interest rates have decreased by about 450 basis points, driven largely by demographic forces (90bps), higher inequality within countries (45bps), and a shift towards higher saving by emerging market governments post-Asian crisis (25bps). Despite stable global saving and investment ratios, desired investment levels have fallen due to a decline in the relative price of capital goods (50bps) and reduced public investment (20bps). The spread between the rate of return on capital and risk-free rates has widened, further lowering desired investment and risk-free rates by 70bps. These factors, combined with lower expectations for trend growth (100bps), account for 400bps of the decline, indicating that central banks are more rate takers than makers, as looser monetary policy is a consequence, not a cause, of falling long-term rates.



