We estimate the age distribution’s effect on business cycle fluctuations across a large number of countries. A 10 percentage point increase in the middle-aged share of the population decreases output volatility by 15 percent for the average country.

As we move into an increasingly connected world for urban travel planning, we need to expand our concept of itinerary planning to meet the multimodal and diverse needs of today's traveler. Often, urban itinerary planning applications seek to minimize route travel time between two specific places...

Multi-modal travel itineraries are based on traversing multiple legs using more than one mode of transportation. The more combinations of legs and modes, the more challenging it is for a traveler to identify a reliable itinerary. Transportation providers collect data that can increase...