Examine the data in Table 6.7 on UK immigrants by ethnicity and generation. The data are from the British Labour Force Survey for the period 1993-2007. The data are the percentage difference in hourly wages between immigrant/ethnic groups and second-plus generation whites. The estimates were calculated by Yann Algan et al. (2010) and take education and potential experience into account. Table 6.7 Average income gap relative to native-born whites, by ethnicity in the United Kingdom Ethnic group Men Women 1st gen. and+ gen. 1st gen. and+ gen. White "34% 26.9% 55% 23.6% "21.3% 31.8% -8.7% -21.4% -17.3% Indian 4-7% 11.0% 30.1% "12.8% "12.9% 9-4% S1% 3-9% -17.6% 2.9% 3.8% -2.3% Pakistani Black African 34-2% 43-5% 21.6% Black Caribbean Bangladeshi Chinese 55-3% -274% Adapted from Algan et al. (2010). A. What patterns do you see in the data? How do these differ across ethnic groups and sex? B. Do the data suggest intergenerational progress? Explain. C. How does the fact that these data are (essentially) from a single cross section affect your interpretation of them? List and explain two challenges.