The J-Curve: a literature review

Due to lag structure, currency devaluation is said to worsen the trade balance first and improve it later resulting in a pattern that resemble the letter J, hence the J-Curve phenomenon. Since its introduction by Magee in 1973 Magee, SP. 1973. Currency contracts, pass through and devaluation. Brooking Papers on Economic Activity, 1: 303–25.   (Brooking Papers on Economic Activity, 1, pp. 303–25), a large number of studies have attempted to test the phenomenon using different techniques and different model specifications. The results are at best ambiguous and deserve to be collected together for the future generation of researchers and graduate students. This paper fills such a vacuum in the literature by reviewing the J-Curve related empirical papers.     

Bilateral J-curve between the UK vis-à-vis her major trading partners

Currency depreciation is said to worsen the trade balance first before resulting in an improvement, yielding a short-run pattern labelled the J-curve phenomenon. While early studies tested the J-curve by using aggregate trade data, a few recent studies have employed bilateral data, mostly between the US and her major trading partners. In this paper we extend the literature by considering the experience of the UK. We test the phenomenon between the UK and her twenty major trading partners by employing data over 1973Q1–2001Q3 period. In most instances, we find no support for the J-curve in the short-run. In the long run, only in five cases has the exchange rate had significant impact on the bilateral trade balance.     

Stock price and systematic risk effects of discontinuation of corporate R&D programs

We extend the evidence on whether investors impound efficiently into stock prices new disclosures about corporate R&D programs. We find that firms that disclose the discontinuation of some of their R&D programs experience a significant negative announcement-period stock price response which is worse for growth stocks, for small-size firms, and for firms with low operating cash flow. We find no evidence that R&D discontinuing firms experience an event-induced change in their systematic risk. We find evidence of a one-year-long price reversal; however, it is not robust to controlling for possible risk dimensions for firms with R&D capital that the three-factor model does not capture. Evidently, investors' initial response at disclosures of discontinuation of corporate R&D programs is efficient.     

Impact of exchange rate volatility on commodity trade between US and Hong Kong

The impact of exchange rate uncertainty on trade flows is still the center of attention in international economics. A few studies that have looked at this effect in Hong Kong have used either aggregate data between Hong Kong and the rest of the world or between Hong Kong and several of her major trading partners. They have been unable to locate any significant effect. Suspecting that existing studies could suffer from aggregation bias, we concentrate on the trade between Hong Kong and the US and disaggregate their trade flows further by commodity. Out of 140 Hong Kong importing industries and 104 exporting industries considered, we find short-run effects in the majority of the industries. The short-run effects translated into the long run in 81 of Hong Kong import industries and 51 of her export industries, a finding that contradicts previous research.     

Non-linear quantile unit root test and PPP: more evidence from Africa

It is now a common practice to establish stationarity of the real exchange rate as a sign of purchasing power parity (PPP) hypothesis. In this article, we consider the real effective exchange rates of 29 African countries. When we apply conventional linear unit root tests, we find support for the PPP in eight countries. However, when we shift to the newly introduced non-linear quantile unit root test, support for the PPP increases to 15 countries.     

Asymmetry effects of exchange rate changes on domestic production in Japan

Previous studies that assessed the effects of currency depreciation on the domestic production of Japan did not find any significant long-run effects. Using the linear ARDL approach we first confirm previous findings. We then argue and show that failure to find any significant link between the value of the yen and Japanese domestic production is due to assuming a linear adjustment mechanism or symmetric effects of exchange rate changes. Once we use the nonlinear ARDL approach we show that indeed exchange rate changes do have asymmetric effects on domestic production in Japan. Not only we observe adjustment asymmetry, but also short-run asymmetry that lasts into the long run. In the long run while strong yen seems to hurt domestic production in Japan, weak yen seems to have no effect.     

S-Curve at the industry level: evidence from US–UK commodity trade

Backus et al. in (Am Econ Rev 84(1): 84–103, 1994) found that the cross-correlation function between terms of trade and trade balance resembles the letter S and labeled it the S-curve. Support for S-curve is rather weak in some cases, most notably US when aggregate trade data are used. Empirical regularities based on aggregate trade data may suffer from a potential bias stemming from aggregation. Indeed, by employing US bilateral trade data excellent support for the S-curve is recovered. The support, however, was rather weak at the level of US–UK bilateral trade. Suspecting aggregation bias again, we employ US–UK trade data at the industry level and find overwhelming support for the S-curve. Furthermore, commodity attributes play no role. Valuable comments of an anonymous referee are greatly appreciated. Any error, however, is ours.     

The J-curve: evidence from commodity trade between UK and China

China is often accused of manipulating its currency to gain international competitiveness. Previous studies have tried to address this issue by investigating the impact of yuan depreciation on China’s trade balance. Not only have they failed to establish the link between the Chinese exchange rate and its trade balance with the rest of the world but also between China and her major trading partners. In this article, we consider the China–UK trade balance and disaggregate their trade flows by commodity. Out of the 47 industries considered, we show that the real depreciation has favourable short-run effects in most industries. However, the short-run effects last into the long run only in seven cases.     

The S-Curve： China versus Its Major Trading Partners

China has been accused of manipulating its currency to gain international competitiveness and enjoy a trade surplus. The S-Curve is a hypothesis that could be used to test the depreciation. It claims that while future effectiveness of currency devaluation or values of the trade balance and current exchange rate are positively correlated, the past values of the trade balance and current exchange rate are negatively correlated. While China＇s aggregate trade flows with the rest of the world conforms to the S-Curve hypothesis, disaggregating trade flows by trading partner reveals that not all partners are affected equally by devaluation. Indeed, trade with 8 out of the 24 partners does not support the S-Curve hypothesis.