Summarized this section explain why this section cut your interest (in one paragraph)

Base salaryThe term base salary acquires a somewhat different meaning when employees go abroad. In a domestic context, base salary denotes the amount of cash compensation serving as a benchmark for other compensation elements (such as bonuses and benefits). For expatriates, it is the primary component of a package of allowances, many of which are directly related to base salary (e.g., foreign service premium, cost-of-living allowance, housing allowance) as well as the basis for in-service benefits and pension contributions. It may be paid in home, local-country currency, or both. The base salary is the foundation block for international compensation, whether the employee is a PCN or TCN. Major differences can occur in the employees package depending on whether the base salary is linked to the home country of the PCN or TCN or whether an international rate is paid.