An Amazon bull says the company's stock is his 'best idea' for 2019. Here's why. (AMZN)

Cowen research analyst John Blackledge called Amazon his "best idea for 2019." Blackledge is bullish on all the major parts of the company's business. He think its advertising and cloud efforts will drive sales and cash flow. But he thinks even its older e-commerce business will give it a significant boost. If you ask John Blackledge, a financial analyst at Cowen, you can't find a better bet for next year than Amazon. The company has numerous opportunities ahead of it that could boost...