This document summarizes findings on the relationship between regional economic success and clusters. It finds a positive relationship between GDP per capita and a region's cluster mix index, which measures how much a region benefits from having a diverse mix of clusters. It also finds a positive relationship with employment in strongly developed clusters that are highly over-represented in a region. The document discusses how clusters can generate new knowledge, products, and services, and how regions can develop policies to attract clusters and support innovation within clusters through initiatives like cluster organizations and public-private partnerships.