By investing in the education and training of its citizens, or ___________ capital, Canada has been able to improve its gross domestic product (GDP) and standard of living.

human

By investing in the education and training of its citizens, or human capital, Canada has been able to improve its gross domestic product (GDP) and standard of living.

The missing word in the sentence is "human capital." Human capital refers to the knowledge, skills, and abilities possessed by individuals in a particular society or country. By investing in education and training, a country like Canada can enhance the skills and knowledge of its citizens, thereby improving the human capital of its workforce.

To determine the missing word, you can break down the sentence and analyze its context. In this case, the sentence talks about how Canada has been able to improve its GDP and standard of living. This improvement is attributed to investing in something related to its citizens. Considering the various types of capital like physical capital (infrastructure, machinery) and financial capital (money, assets), the most suitable answer is human capital.