Europe tried to boost Covid-19 vaccine takeup with carrots. Now some leaders are breaking out the sticks

As the pace of Covid-19 vaccinations in Europe shows signs of a slowdown, leaders are racing to find answers to a key dilemma of the rollout's next phase: how to convince reluctant citizens to roll up their sleeves. From cash payments to phone data, free football stadium tours to free grilled meat, officials have offered up a range of carrots to entice people to get shots.