Over the past decade, research in theoretical computer science, artificial intelligence, and microeconomics has joined forces to tackle problems involving incentives and computation. These problems are of particular importance in application areas like the Web and the Internet that involve large and diverse populations. The Conference on Web and Internet Economics (WINE, formerly Workshop on Internet & Network Economics) is an interdisciplinary forum for the exchange of ideas and results on incentives and computation arising from these various fields. Invited speakers of previous WINEs include not only many famous theorists from prestigious universities in the world, such as the winner of the Nobel Memorial Prize in Economics Kenneth J. Arrow, but also top researchers from many big business, such as Microsoft Research, Yahoo! Research, IBM Research, Google Inc., ebay Research Labs and so on. Participants of WINEs come from universities and industries as well. WINE 2014 is organized jointly by Academy of Mathematics and Systems Science (AMSS) within Chinese Academy of Sciences and Tsinghua University (THU). AMSS is a national comprehensive academic research center of mathematics and systems science and THU is one of the most renowned universities in China.