How to Read a Bubble Chart
A bubble chart provides perspective on three dimensions: the size,growth, and employment concentration in a cluster. Cluster bubbles arranged together in a chart help to communicate the overall regional picture. It tells what industries make up the region, their size, growth, and relative employment concentration.

The size of the bubble shows the employment size for the industry cluster. The x-axis displays the annual average growth rate each industry cluster grew or declined between 1995 and 2006. The y-axis displays the employment concentration of each industry cluster and its ratio to California’s employment in a cluster. A concentration greater than one indicates Solano County has relatively more employment in that cluster as compared to the State’s economy as a whole.