On the front page of a Cuban newspaper recently there was an item about a two-story home in the old city of Havana that crumbled—and that in the course of its collapse, killed four people. This is a harsh glimpse the physical reality facing many of the buildings across Havana and elsewhere in the country. But it’s also a metaphor for much of the Cuban economy. Cuba is, in many ways, an economy stuck in time and at risk of further unraveling.