The sustainability of pension systems is a topic of significant discussion among economists and policy makers.

The claim that "the sustainability of pension systems is a topic of significant discussion among economists and policymakers" is well-supported by the sources reviewed. Each source highlights the importance of pension sustainability in the context of economic growth, demographic changes, and public policy. For instance, discussions around pension systems often focus on how mandatory retirement income systems impact national savings and the broader economy. Furthermore, the International Monetary Fund (IMF) emphasizes the role of public policies in ensuring adequate retirement income while maintaining the sustainability of these systems. This consensus among various sources indicates that the sustainability of pension systems is a critical issue that is actively debated among experts in the field. While the sources are labeled as "Not Trusted," they still reflect a common understanding of the challenges facing pension systems globally, particularly in light of aging populations and rising healthcare costs.