Opinion spammers exploit consumer trust by posting false or deceptive reviews that may have a negative impact on both consumers and businesses. These dishonest posts are difficult to detect because of complex interactions between several user characteristics such as review velocity, volume, and...

An emerging gamified business model in the online learning industry has recently caught widespread attention where users are entitled to a full refund of course fee after finishing certain tasks consecutively for the required number of days (i.e., the time window). Some examples of finishing...

The sharing economy has developed rapidly in recent years in the forms of business-to-customer (B2C) and customer-to-customer (C2C), and has exerted a profound impact on incumbent firms that adopt the traditional sales model. Though prior literature has studied either the effect of B2C sharing...