Take Five: World markets themes for the week ahead
A specialist trader works on the floor of the New York Stock Exchange (NYSE) in New York, U.S., September 19, 2018. REUTERS/Brendan McDermid · Reuters · Reuters

LONDON (Reuters) - Following are five big themes likely to dominate thinking of investors and traders in the coming week and the Reuters stories related to them.

1/BOND ON THE RUN

U.S. Treasuries -- and maybe financial markets across the world -- are at a critical juncture. The bond selloff is gathering pace, pushing 10-year yields above 3 percent to the highest since May and within sight of levels last seen in 2011.

Is this the breakout, the reversal of the 30-year bull market, that some people have spent years predicting? If 10-year yields break above 3.128 percent, that view will gain credence. There are still plenty of political, fundamental and relative valuation reasons for buying bonds. But once a market move picks up momentum, it can be hard to stop.

The 10-year Treasury yield matters because it is the rate against which trillions of dollars of borrowing around the world are referenced. It touches every market in the world.

But markets, curiously, are not paying as much attention as one would expect. Wall Street sailed to new highs in the past days, emerging market stocks are up four weeks out of the last five, and market volatility remains low. Even Treasury market volatility. It could get more interesting in the coming week.

GRAPHIC: U.S. 10-year Treasury note yield - https://reut.rs/2prKKit

2/WAITING FOR THE FED

A rate hike at the U.S. Federal Reserve's Sept. 25-26 policy meeting is all but certain - taking the rate to 2.00 percent-2.25 percent. And the odds have also increased for a December rise and more bumps up into 2019.

But market watchers have already turned their attention to the question of when to call the next economic downturn.

The traditional indicator is the yield curve inverting -- in the United States this has been a pretty accurate predictor of recessions. However, another interesting sign could be read from the relationship between the fed funds rate and employment.

The fed funds rate has risen above the employment rate ahead of prior recessions - and the unemployment rate, currently 3.9 percent, is now near the lowest in 18 years.

So the fed funds rate and the employment rate are still a far bit apart. But they are inching closer and another hike will trim the gap a little bit more.

GRAPHIC: Beyond the U.S. yield curve - https://reut.rs/2MQ2ZYr

3/RRR-ALLYING THE TROOPS

Much of the emerging market universe is in a rush to tighten monetary policy, but in China speculation is rife that authorities will ease reserve requirement ratios (RRR) again.

For one, the pattern of this year's RRR cuts has been a quarterly one. Second the economy has been looking more sluggish. And finally, new U.S. tariffs of 10 percent on about $200 billion of Chinese products will kick in on Sept. 24, rising to 25 percent by year-end. China's retaliatory tariffs on 5,207 U.S. products also enter into force in the coming week.