A large literature explores whether asset returns comove in excess of what can be explained by fundamentals, thus suggesting the existence of frictions or behavioral biases. However, we show that comovement is a ubiquitous feature of asset returns that will arise in the presence of latent or...

Freemium products must attract a disproportionately large user base to capture value, but they are often “hit or miss”. Which freemium products are best positioned to becoming a killer app, and under what conditions? Drawing on freemium's distinguishing features of low adoption barriers and...

With the continuous growth of mobile market, many firms are considering investing in mobile apps. Through the lens of stock market reaction, we find that on average public firms experience a negative abnormal stock return on the day when they release their first mobile app and mobile app...

"Freemium” whereby a basic service level is provided free of charge but consumers are charged for more advanced features has become a popular business model for firms selling digital goods. However, it is not clear whether the launch of a free version helps or hurts the sale of an existing...

Underwater Wireless Sensor Networks (UWSNs) enable a variety of applications such as fish farming and water quality monitoring. One of the critical tasks in such networks is localization. Location information can be used in sensor networks for several purposes such as: (i) data tagging in which...

Wearable devices (WDs) are a specific part of the general concept of the “Internet of Things”. This concept refers to infrastructure in which many sensors are designed to record, process, and store data locally, or interact with each other both in the medium range, through the use of radio...

This short note constructs Mobility Zones to facilitate the discussion on the geographic extent of individual mobility restrictions to control the spread of Covid-19. Mobility Zones are disjoint sets of counties where a given level of individual mobility directly or indirectly connects all...

Mobile users (or UEs, to use 3GPP terminology) served by small cells in dense urban settings may abruptly experience a significant deterioration in their channel to their serving base stations (BSs) in several scenarios, such as after turning a corner around a tall building, or a sudden knot of...

Cellular network is a fundamental technology for mobile phones, personal communication systems, wireless networking etc. This technology is developed for mobile phone to replace high power transmitter/receiver systems. It use very low power with a short range and higher rate of data...