Alphabet has multiple tailwinds pushing it higher.Nvidia is the only $4 trillion stock in the world right now after becoming the first company to ever cross that threshold. As megacap stocks continue to push the market higher, it's natural to wonder who will eventually emerge as the first$5 trillion company.Though it currently sits in fourth place among the world's largest companies with a market cap of $2.8 trillion, Alphabet (GOOG 1.04$5 trillion if it can get t ...