Counterfeiters: Foes or Friends? How Counterfeits Affect Sales by Product Quality Tier
结合自然政策实验和随机实验室实验，研究假冒产品对不同质量层级正品销售的影响，发现假冒对高端正品有广告效应，对低端正品有替代效应。
A key concern about counterfeits and weak intellectual property protection is that they may hamper innovation by displacing legitimate sales. This paper combines a natural policy experiment with randomized lab experiments to estimate the heterogeneous impacts of counterfeiting on the sales and consumer purchase intent related to branded products of various quality levels. I collect new product-line-level panel data (1993–2004) on Chinese shoe companies. I identify heterogeneous effects of counterfeit entry on sales of authentic products of three quality tiers, finding that counterfeits have both advertising effects for a brand and substitution effects for authentic products, additionally the effects linger for some years. The advertising effect dominates the substitution effect for high-end authentic product sales, and the substitution effect outweighs the advertising effect for low-end product sales. The positive effect of counterfeits is most pronounced for high-fashion products (such as women's high-leg boots and dress shoes), shoes tailored to young customers, and high-end products of brands not yet well-known at the time of counterfeiter entry. This paper was accepted by David Hsu, entrepreneurship and innovation.