Prevailing theory claims that churches thrive when they overcome the free-rider problem. However, this paper argues that religious organizations need free-riders in a dynamic setting. If individuals’ contributions to congregations increase as their exposure to religion increases, then allowing potential members to free-ride temporarily may increase future membership and contribution levels. Fre...

This paper introduces a new and freely available Modelica library for the purpose of simulation, analysis and control of bicycles and motorcycles (single-track vehicles). The library is called MotorcycleLib and focuses on the modeling of virtual riders based on automatic controller design. For the single-track vehicles, several models of different complexity have been developed. To validate the...

Jet skiing is a rapidly growing sport. The craft incorporate safety features and the manufacturers issue detailed safety instructions. Racing is conducted with adequate attention to clothing, safety and insurance. However, casual use is widespread and is sometimes irresponsible. Serious injuries to riders are uncommon: dental and knee injuries are described. A case of renal contusion and a head...

Providing transparency into operational processes can change consumer and worker behavior. However, it is unclear whether beneficial with potentially biased service providers. We explore this in the context of ridesharing platforms where early evidence documents bias similar to what has been observed traditional transportation systems. Platforms responded by reducing through removing informatio...