By Paul Hannon 
 

Despite falling unemployment rates, there are few signs that rising wages will soon start to push inflation higher in either the U.S. or the U.K., where central banks are expected to raise their benchmark rates next year and in early 2016 respectively.

In both countries, policy makers expect tightening labor markets to result in a pickup in wages that will translate into higher consumer prices, as businesses act to protect their profit margins and as consumer demand strengthens.

But an internationally comparable measure of labor costs released Thursday by the Organization for Economic Cooperation and Development showed no sign of a buildup in inflationary pressures from that source in either country.

Indeed, the Paris-based research body recorded a 0.1% drop in unit labor costs in the U.S. during the third quarter, which followed a 0.6% decline in the second quarter.

In the U.K., it recorded a 0.1% rise, marking a slowdown from the 0.6% gain in the second quarter. In both cases, ULCs were weaker than the average across the OECD's 34 members, most of which are developed economies.

The Federal Reserve on Wednesday took a delicate step toward raising short-term interest rates in 2015, but policy makers said their decisions will be "data-dependent," meaning they will depend on the path of the economy.

While the inflation rate has been below the Fed's target for nearly three years, many officials believe that as labor-market slack diminishes, inflation will move back toward 2%.

Wages did rise in both the U.S. and the U.K. during the quarter, but in the U.S. productivity rose more rapidly. That means that across the economy as a whole, the labor cost of producing a unit of gross domestic product fell. In the U.K., productivity rose almost as fast as wages.

In the minutes of their December meeting, released Wednesday, the Bank of England's policy makers acknowledged that ULCs are not yet rising quickly enough for them to be sure of meeting their 2% inflation target.

"Further increases in pay growth, as labour market slack continued to decline, would be required to be consistent with the 2% inflation target in the medium term," the minutes said.

By contrast, the eurozone registered no productivity growth in the third quarter, following a decline in the second. So even though wage growth was weaker than in the U.S. or the U.K., labor costs rose more rapidly, albeit still very modestly.

But they didn't entirely rise in the right paces.

The eurozone's strategy for confronting its economic woe has focused in part on what is termed an "internal devaluation," or cutting labor costs in southern Europe, while hoping they rise in northern Europe. Without the option of devaluing their currency, that has been seen as the only way in which southern European countries could regain competitiveness lost to their northern counterparts in the decade after the euro was launched.

But while labor costs rose 0.7% in Germany, they increased just as rapidly in Italy, and faster in Portugal.

-Write to Paul Hannon at paul.hannon@wsj.com