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Dow on pace for best day in four months

The Dow delivers its best day since April, with a nice triple-digit gain. Plus, Walmart’s blowout quarter  — we break down what went right. And, is there good news for Tesla? It’s our call of the day. Plus,  contagion; it’s a dirty word on Wall Street. Why it could be spreading – here. Catch The Final Round at 3:30 ET p.m. with Jen Rogers, Yahoo Finance markets correspondent Myles Udland, and columnist Rick Newman