Stephan's Tuesday Picks

• Roger Martin: The two rules that monopolists ignore at their own peril (Medium)
• Everyone wants sushi to go, and it's saving some restaurants (WSJ)
• Jassy's 'chop' meetings at Amazon makes sense (Bloomberg)
• Walmart announces new vision for its media business (Walmart)
• Walmart buys ad-tech to chase small business advertisers (WSJ)