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* Graphic: World FX rates in 2017 tmsnrt.rs/2egbfVh
* Oil prices skid into bear market, Brent at 7-month trough
* Investors price in lower inflation, boost long-term bonds
* Asia, Europe shares stumble as energy stocks fall
* China stocks get limited lift from MSCI inclusion
* Dollar underpinned, sterling nurses losses after BoE comments
By Marc Jones and Sujata Rao
LONDON, June 21 (Reuters) - A renewed slump in oil prices to seven-month lows dragged down world stocks on Wednesday and flattened bond curves as bets that inflation and interest rates will stay lower for even longer began to build again.
Signs of a growing glut of supply sent Brent crude futures skidding back to $45.50 a barrel as European trading gathered momentum. Poorly performing banking stocks also made for a weak start for London, Paris and Frankfurt's stock markets.
The slide in energy costs boosted bond prices and flattened yield curves as investors priced in lower inflation for longer, while safe-haven flows underpinned the Japanese yen.
The spread between yields on U.S. five-year notes and 30-year bonds shrank to the smallest since 2007 as investors wagered the Federal Reserve might have to delay further rate hikes.
Thirty-year German debt yields bonds also tumbled back towards two-month lows, adding to a more than 20-basis-point drop over the past month and ahead of what will now be a closely watched sale of 30-year debt in Berlin later.
"The plunge in oil prices ignited a bull flattening on the German and U.S. curve," analysts at UniCredit said in a note adding that it suggested "reflation trades are finally deflated."
The recent setback for crude and commodity prices as well some equity markets is partly down to doubts over U.S. President Donald Trump's promised multi-trillion dollar stimulus programme, which had raised hopes of boosted inflation and growth.
"Brent now the lowest since mid-November: remember that whole reflation thing? No, neither does the market," Rabobank analysts told clients in a reference to Brent crude futures, which have slid almost 10 percent this month.
Oil had shed 2 percent on Tuesday, taking U.S. crude futures 20 percent off recent highs and thus into official bear territory, a red flag to investors who follow technical trends.
In Asia there had been muted reaction to global index provider MSCI's decision to add the first batch of mainland Chinese stocks to its popular emerging equity benchmark.
Indexes in Shanghai and Shenzen moved around 0.5 percent higher after the decision, which could ultimately bring $340 billion of foreign capital to the so-called A-share market.
The commodity and bond market turbulence and falls in Europe pushed MSCI's all-country share index down 0.3 percent after its 0.7-percent slide on Tuesday compounded by a weak close on Wall Street .
The acceptance of some Chinese "A" shares into MSCI's Emerging Markets Index was seen as a symbolic win for Beijing after three failed attempts. Yet the step is still a small one.
Only 222 stocks are being included and, with a weighting of just 5 percent, they will account for only 0.73 percent of the Emerging Markets Index.
MSCI estimated the change, due around the middle of next year, would drive inflows of between $17 billion and $18 billion. China's market cap is roughly $7 trillion.
The index provider set out a laundry list of liberalisation requirements before it would consider further expansion.
"We suspect that it will be a long time before this happens," wrote analysts at Capital Economics in a note.
"While China's weighting in the MSCI Emerging Markets Index may ultimately rise to 40 percent or so, this rise is likely to be slow," they added. "The upshot is that any initial boost to equities is likely to be small."
The initial reaction was indeed restrained, with China's CSI300 index up 0.5 percent.
MSCI also said it would consult on adding Saudi Arabia to the emerging markets benchmark and that Nigeria will remain a frontier market, but it shocked many emerging market investors by declining to upgrade Argentina from the frontier market category.
In currency markets, the flight from oil and into long-dated government bond benefited the safe-have yen which climbed to 111.120 per dollar. The U.S. currency was holding its own elsewhere though - oil and the greenback often move inversely. Against a basket of currencies, it was steady at 97.736 having touched a five-week peak overnight.
The euro stood at $1.1131 after hitting a three-week low, while the dollar eased a touch on the yen to 111.27.
Sterling was still in the firing line sliding back under $1.26 and towards 90 percent per euro.
It took a spill after Bank of England Governor Mark Carney hosed down speculation that he might soon back higher interest rates, saying he first wanted to see how the economy coped with Brexit talks.
Reporting by Wayne Cole; Editing by Eric Meijer and Andrew Heavens