Another battle between Western and Eastern members of the European Union looms on the horizon. This time, the debate will focus on the status of "posted workers," or laborers sent by their employers to work in another EU member state temporarily. While dispatched abroad, the social security rules of the posted worker's country of origin still apply. Consequently, companies are able to pay posted workers from Eastern and Central Europe less than their Western European peers. Though posted workers represent less than 1 percent of the Continent's workforce, the issue is controversial: High-salary countries such as France, Austria and the Netherlands argue that the system gives workers from low-salary countries such as Poland or Romania an unfair advantage. French president Emmanuel Macron will discuss this issue with Austrian, Czech, Slovak, Romanian and Bulgarian leaders during a tour of Eastern Europe on Aug. 23-25.