NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

NBER Publications by Yang Wang

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Working Papers and Chapters

October 2010Estimating Dynamic Discrete Choice Models with Hyperbolic Discounting, with an Application to Mammography Decisions
with Hanming Fang: w16438
We extend the semi-parametric estimation method for dynamic discrete choice models using Hotz and Miller's (1993) conditional choice probability (CCP) approach to the setting where individuals may have hyperbolic discounting time preferences and may be naive about their time inconsistency. We illustrate the proposed estimation method with an empirical application of adult women's decisions to undertake mammography to evaluate the importance of present bias and naivety in the under-utilization of this preventive health care. Our results show evidence for both present bias and naivety.
May 2008China's Growing Economic Activity in Africa
with Hany Besada, John Whalley: w14024
Trade between the whole of Africa and China (imports and exports summed) grew from $10.6 billion to $73.3 billion between 2000 and 2007, and between Sub-Saharan Africa and China from $7 billion to $59 billion over the same period. China is now Africa's third largest trading partner behind the EU and the US. The Chinese FDI stock in Africa has grown from $49 million in 1990 to $2.6 billion in 2006. On the basis of these data, one frequently hears the claim that China is now a dominant influence in Africa. Here we both evaluate such claims, and assess what factors underlay this phenomenon. We suggest that while the annual growth rates of trade and investment flows are high (around 30% per year sine the late 1990's), the levels are still considerably smaller than such claims might suggest. Ch...

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