Stephan's Tuesday Picks

• Roger Martin: Strategy for start-ups - redux (Medium)
• From bad to worse: Canada's productivity slowdown is bad for everyone (TD)
• He used to bag groceries. Now Kroger's CEO is trying to save a $20 billion deal (WSJ)
• The plastics industry wants to redefine what's 'recyclable' (Propublica)
• Lego's business cards are made of Lego - but not for long (WSJ)