What is the fine-grained topic of the following text: A 10-year, $6 billion annual investment into repairing and upgrading California’s transportation infrastructure would generate an estimated $111.9 billion in economic activity including 570,000 jobs – nearly 200,000 of which would be in construction occupations earning prevailing wages, $38.7 Billion in personal income and $4.5 Billion in additional local and state tax revenues. Only return the topic.
Economic impact of investing in California's transportation infrastructure