CitiBike is a privately owned public bicycle sharing system serving New York City and Jersey city in New Jersey named after its main sponsor Citigroup. It was started as an attempt to reduce emissions and traffic congestion in 2013. My idea is customers would ride their bikes longer in order to get a better value of the money they have paid for only a few rides as compared to subscribers who will be using it throughout the year and might not share the same zest to get back the value for the money they have paid in every single ride.

The average duration of trips taken by subscribers is _the same_ or _higher_  than the average duration of trips taken by customers