Essays on technology and innovation

The IT age is marked by innovative approaches to the online commerce.Technology as the core of innovation has undergone numerous evolutionsthrough the “creative destruction." Motivated by the phenomena andthe challenges in the technology-driven markets, I explore the economic role of innovation from different angles in the following essays.Chapter 1 focuses on firms’ competitive strategies while constructingnovel business models in delivering online services. In particular, I am interested in their bundling of marketing services with the core business. In a game theoretic model, I derive competing firms' equilibrium strategies with choices between three business models, no ad-support, ad-support with the optional advertising strategy, and the mandatory advertising strategy, and find that competitive business models can be differentiation-driven or advertising driven depending on market ad aversion. Interestingly, mandatory advertising weakly dominates optional advertising under certain market conditions. My findings offer new insights to the bundling literature.Chapter 2 examines the performance-based auction model in the iconiconline advertising innovation, keyword auctions. I analyze advertisers' decision of utilizing their existing reputation from a primary auction upon entering a new auction. The short-term and long-term setups are modeled for analyzing seasonal marketing in a new auction and branding a new product, in examining the impact of new market size, performance, and risk on advertisers' decisions. While an optimistic new market encourages reputation stretching, in the long-term setup it further depends on the performance difference between the two markets. A higher risk is found to induce stretching under intensive competition for both cases; in the long-term, stretching decision is determined by the market size.Chapter 3 examines the connection between business cycles and innovation and offers insights for regulatory innovation policies. Combining endogenous market structure with the dynamic game framework, I study the Markov perfect equilibrium where heterogeneous firms choose their innovation rates. I find that increased per-capita income tends to improve aggregate innovation, while income inequality shocks may reduce innovation conditional on the market structure. I also find subsidies to dampen innovation incentives, and policies such as tax credits that reduce the variable R&D costs to have positive effects on innovation.