What sell-off? Stocks have now erased their losses for the year

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• The S&P 500 and Nasdaq-100 rose on Tuesday to turn positive for the year.
• It's the first time the benchmark indexes have been up year to date since February.
• Markets have been encouraged by progress on a US-China trade deal and cooler inflation.

After weathering a historically volatile April, stocks have recovered all their losses and then some in the first few weeks of May, with the S&P 500 and the Nasdaq-100 up year to date in Tuesday's session.