By Lawrence Delevingne BOSTON (Reuters) -A positive jobs report spurred Wall Street to push some stocks and Treasuries higher on Friday, but investor optimism was tempered by looming inflation, a potential decline in Federal Reserve stimulus and the coronavirus’ Delta variant. Nonfarm payrolls increased by 943,000 jobs in July after rising 938,000 in June, the Labor Department said in its closely watched employment report on Friday, pushing unemployment down to 5.4% and suggesting the economy maintained its strong momentum. Economists polled by Reuters had forecast payrolls increasing by 870,0…

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