This book analyses the most important problems and challenges of the current labour market from the point of view of the balance between the parties of the employment contract. The contributions here are related to various pressing topics, including, for example, the future of work and worker protection on an international level against the strengthening of employers' powers. In addition, the nature and limits of employers' power, non-competition contractual clauses and workers' rights in the face of new communication and information technologies are also discussed. The contributors are drawn from several countries, such as Portugal, Spain, Bolivia, Italy, Mexico and Switzerland.The book will appeal to lawyers, legal experts, human resources experts, economist, judges, academia, and staff from companies and trade unions, and employers' representation.The volume features insights and contributions in different languages, with chapters in Spanish (12), English (4) and Portuguese (5).