What's the optimal degree of concentration in your portfolio? (0:25) Jason Moser discusses: - Nvidia warning that 2nd-quarter revenue will be lower than they'd previously guided - Why Nvidia's long-term thesis appears to be intact - A listener's question about whether to sell some winners in his portfolio (12:31) Shopify's down 70% this year. Does the former high-flier have enough of a moat to fend off the likes of Amazon? Ryan Henderson and Jose Najarro join Ricky Mulvey in a bull vs. bear debate over Shopify. Who made the better argument? Vote in our Twitter poll @MotleyFoolMoney Stocks mentioned: NVDA, SHOP, AMZN Host: Chris Hill Guest: Jason Moser, Ryan Henderson, Jose Najarro Producer: Ricky Mulvey Engineers: Dan Boyd, Rick Engdahl