Zigan Wang
Dr. Zigan WANG
Assistant Professor

2859 1045

KK 902

Currency Volatility and Global Technological Innovation

We investigate the real effects of foreign exchange (FX) volatility on technological innovation. Using a 32-market, three-decade sample, we show that heightened FX volatility associates with significantly lower firm-level R&D expenditures, patents granted, and forward citations. The negative FX volatility-innovation relation can be attributed to precautionary savings needs and trade slowdown. The relationship is stronger for firms with financial constraints, with the use of foreign debt, and in more open economies; it is weaker for firms with derivatives hedging, with higher sales, and in countries with better financial development.


企業在外國投資,外匯波動是其中一項重要考慮因素。香港大學經管學院金融學助理教授王自干早前與其他學者進行研究,分析截至2017年的30年內,逾4000間跨國公司的外匯敞口數據,指出若外匯波動提升一個標準差 (standard deviation)會令跨國企業隔年的投資規模平均減少逾半。

Real Effects of Share Repurchases Legalization on Corporate Behaviors

We use staggered share repurchases legalization from 1985 to 2010 across the world to examine its impact on corporate behaviors. We find that share-repurchasing firms do not cut dividends as a substitution. The cash for repurchasing shares comes more from internal cash than external debt issuance, leading to reductions in capital expenditures and R&D expenses. While this strategy boosts stock prices, it results in lower long-run Tobin's Q, profitability, growth, and innovation, accompanied by lower insider ownership. Tax benefits and paying out temporary earnings are two primary reasons that firms repurchase.

Bank Networks and Acquisitions

Does the predeal geographic overlap of the branches of two banks affect the probability that they merge, postannouncement stock returns, and postmerger performance? We compile information on U.S. bank acquisitions from 1984 through 2016, construct several measures of network overlap, and design and implement a new identification strategy. We find that greater predeal network overlap (1) increases the likelihood that two banks merge; (2) boosts the cumulative abnormal returns of the acquirer, target, and combined banks; and (3) reduces employment, boosts revenues, reduces the number of branches, improves loan quality, and expedites executive turnover.