This book explores foundations of revenue models in the games industry and studies the effect of video game characteristics on market shares of games under different revenue model structures using a unique Gameopedia AS dataset and the collected market data. It finds that digitisation of markets has allowed creation of digital pay-to-play and free-to-play models on the basis of classic pay-to-play model, and identifies their main differences to be in monetisation schedules, market-vs-social exchange norms evoked and preferences of consumers. Its findings suggest an important insight: digitisation of revenue models allows creation of new independent markets within the same industry. The study concludes by suggesting a set a parameters for each of the above revenue models, which play the key role in determining the market share of a game in a particular market.