The labor force is the number of people who are employed plus the unemployed who are looking for work. The labor pool does not include the jobless who aren't looking for work.
For example, stay-at-home moms, retirees, and students are not part of the labor force. Discouraged workers who would like a job but have given up looking are not in the labor force either. To be considered part of the labor force, you must be available, willing to work, and have looked for a job recently. The official unemployment rate measures the jobless who are still in the labor force.
The size of the labor force depends not only on the number of adults but also how likely they feel they can get a job. So, the labor pool shrinks during and after a recession. That's true even though the number of people who would like a full-time job if they could get it may stay the same. The real unemployment rate measures all the jobless, even if they're no longer in the labor force.
The U.S. Bureau of Labor Statistics measures the labor force. It provides the monthly employment report, which also provides the nation's current unemployment rate.

A surplus in the capital account means money is flowing into the country, but unlike a surplus in the current account, the inbound flows effectively represent borrowings or sales of assets rather than payment for work. A deficit in the capital account means money is flowing out of the country, and it suggests the nation is increasing its ownership of foreign assets.