In this thesis, I have examined whether the current approach to competition policy is suitable for the distinct characteristics of the digital economy. It is particularly difficult to define the relevant market and rely on market share test as a proxy for market power in the digital economy...

The Digital Markets Act makes clear choices about important tradeoffs in value to constrain the arbitrary power and dominance of gatekeepers over digital markets and guarantee a more equitable distribution of value with business users. We argue that the extent those objectives will be realized...

We consider the merits of the recent EU’s Digital Markets Act from the perspective of innovation and value creation. We conceptualize innovation as new interactions being created by the digital platform leading to ‘value creation’, in contrast to facilitating existing interactions or...

Digital platforms represent a new, potent disruptive force in incumbents’ businesses by transforming the way markets work and by altering the modalities by which incumbents’ offerings are delivered to and both accessed and consumed by customers. Digital platforms tend to disrupt in two basic...

This paper explains why platforms such as Amazon and Visa rely predominantly on ad-valorem fees, fees which increase proportionally with transaction prices. It also provides a new explanation for why ad-valorem sales taxes are more desirable than specific taxes. The theory rests on the ability...

This paper examines optimal managerial decisions in markets where goods may be distributed directly by their producers and/or by an intermediary akin to an online platform. We characterize the optimal design of the platforms' trading strategy, under two distinct business models: a marketplace...

This paper investigates a puzzle and possible policy concern: Why do platforms such as eBay and Visa that enable the trade of goods of different unobserved costs and valuations rely predominantly on linear ad-valorem fees, that is, fees that increase in proportion to the sale price of the trades...

In December 2020, new regulation of digital markets was proposed by European Commission. It specifically addresses main concerns raised by business behavior of operators of core services in their gatekeeping positions. However, voice assistants (or digital personal assistants, DPAs, e.g. Apple's...

We study competition among market designers who create new trading platforms, when boundedly rational traders learn to select among them. We ask whether efficient platforms, leading to market - clearing trading outcomes, will dominate the market in the long run. If several market designers are...

In this paper, we empirically study how flagship entry in an online marketplaceaffects consumers, the platform, and various sellers on the platform. We find flagship entry may benefit consumers by expanding the choice set, by intensifying price competition within the entry brand, and by...