With the significant rise in immigration to the U.S. over the last few decades, fully understanding the economic impact of immigration is paramount for policy makers. As such, this dissertation consists of three empirical essays contributing to the literature on the impact of immigration. In my first essay, I re-examine the impact of immigration on housing rents and completely controlling for endogenous location choices of immigrants. I model rents as a function of both contemporaneous and initial economic and housing market conditions. I show that existing estimates of the impact of immigration on rents are biased and the source of the bias is the instrumental variable strategy common in much of the immigration literature. In my second essay, I present a new approach to estimating the effect of immigration on native wages. Noting the imperfect substitutability of immigrants and natives within education groups, I posit an empirical framework where labor markets are stratified by occupations. Using occupation-specific skill to define homogeneous skill groups, I estimate the partial equilibrium (within skill group) effect of immigration. The results suggest that when one defines labor market cohorts that directly compete in the labor market, the effect of immigration on native wages is roughly twice as large as previous estimates in the literature. In my third essay, I return to the housing market and examine the effects of immigration within metropolitan areas. Specifically, I investigate the relationship between immigrant inflows, native outflows, and rents. Taking advantage of the unique settlement patterns of immigrants, I show that the effect of immigration on rents is lower in both high-immigrant neighborhoods and portions of the rent distribution where immigrants cluster. Contrary to the existing belief in the literature, the results suggest that the preferences of natives, not immigrants, bid up rents in response to an immigrant inflow.

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Many companies of Taiwan have been moved to Mainland China due to Mainland China have greatly promoted in economic. Many companies have been closed or downsized in Taiwan due to politic-insecurity in Taiwan recently. The economic of Taiwan regressed more drastic. Many people are out of employment increasingly. Many companies belong to government having been changed to private enterprise. It makes employees fell threatened under organization change context, so that they breed job insecurity and their working attitude will be affected. After referring to the relative data, the thesis considers that under organization change context makes employees have job insecurity, which affects their job involvement. In addition, personality of internal-external control, employee self-efficiency and specific skill interfere with affection toward job insecurity under organization change context. Based on above inferences, the thesis' target people who are professionals in Chinese Petroleum Corporation to make an investigation framework and construct hypothesizes. It leads to the following points: (1) CPC professionals score higher in the matter of job insecurity toward job's characteristic change, job reshuffle and overall insecurity. (2) These professionals perceive job insecurity, insecurity of job reshuffle and overall insecurity more when organization change context is more drastic. (3) If these professionals score higher in job insecurity of job reshuffle, they will have less job involvement. (4) If these professionals score higher in perceive job insecurity, and overall insecurity they will have more job involvement. (5) If these professionals score higher in employee self-efficiency they will have more job insecurity. (6) If these professionals score higher in specific skill interfere they will have more perceive job insecurity, and overall insecurity. (7) Personality of internal-external control interferes with affection toward job insecurity of job reshuffles insecurity under organization structure and business change factor of organization change context.