Erik McGregor / LightRocket via Getty Images Some trading services let you automatically track others' trades. Key Takeaways Brokerages are starting to roll out copy trading on their platforms for U.S. users. eToro founder Johnathan "Yoni" Assia said its copy-trading product would be "an important driver of growth in the U.S." "Copy + paste" is becoming a trending investment strategy. The masses have long tried to emulate legendary investors like Warren Buffett and Peter Lynch, religiously reading ...