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* U.S. May consumer spending rises moderately; inflation higher
* S&P 500 headed for worst first-half since 1970
* Indexes down: Dow 0.72%, S&P 0.58%, Nasdaq 0.81% (Adds comments, updates prices to early afternoon)
By Shreyashi Sanyal and Amruta Khandekar
June 30 (Reuters) - U.S. stocks slipped on Thursday, setting the Dow up for its worst first six months since 1962, on concerns that a dogged pursuit by central banks to tame inflation would hamper global economic growth.
Fears over slowing growth and surging prices have rippled through markets, with recession worries taking center stage as monetary policymakers across the world look to aggressively raise borrowing costs.
Federal Reserve Chair Jerome Powell on Wednesday vowed to not let the U.S. economy slip into a "higher inflation regime", even if it means raising interest rates to levels that put growth at risk.
The tech-heavy Nasdaq Composite came off session lows but was still set for its largest declines ever for the first-half, while the benchmark S&P 500 tracked its biggest January-June percentage drop since 1970.
All the three main indexes are on course to post their second straight quarterly declines for the first time since 2015.
Fed policymakers in recent days have set expectations for a second 75-basis points interest rate hike in July even as economic data painted a dour picture of the American consumer.
"Until inflation meaningfully rolls over which at this point will take, I believe months, it's going to be hard for the market to really find a bottom and begin a rally," said Ross Mayfield, investment strategy analyst at Baird.
Meanwhile, consumer spending, which accounts for more than two-thirds of U.S. economic activity, rose less than expected in May, indicating a tepid rebound in growth in the second quarter, while inflation maintained its upward trend.
"A lot of investors were expecting inflation data to really start to come down. But what we're finding is that it's a lot more challenging, and that the inflation data is remaining elevated for longer and probably has not peaked," said Sam Stovall, chief investment strategist at CFRA.
Large-cap growth stocks including Microsoft Corp, Apple Inc, Amazon.com Inc and Tesla Inc fell between 0.5% and 2%, leading declines for the day.
At 12:01 p.m. ET the Dow Jones Industrial Average was down 224.38 points, or 0.72%, at 30,804.93, the S&P 500 was down 22.26 points, or 0.58%, at 3,796.57 and the Nasdaq Composite was down 90.17 points, or 0.81%, at 11,087.72.
Heading into the second half of the year, bruised markets will continue to focus on inflation, unemployment and interest rate increases along with their impact on corporate earnings.
"There's a sense that the earnings picture is going to be the next shoe to drop and that downward revisions to earnings will catalyze another leg lower in the market," Baird's Mayfield said.
Walgreens Boots Alliance Inc fell 4.5% as the drugstore chain maintained its full-year earnings forecast due to declining COVID vaccinations.
Declining issues outnumbered advancers for a 1.87-to-1 ratio on the NYSE and for a 1.79-to-1 ratio on the Nasdaq.
The S&P index recorded one new 52-week high and 42 new lows, while the Nasdaq recorded 11 new highs and 332 new lows.
(Reporting by Shreyashi Sanyal and Amruta Khandekar in Bengaluru; Additional reporting by Medha Singh; Editing by Arun Koyyur)