What is the fine-grained topic of the following text: Since 2004, Firestone Liberia, an indirect subsidiary of Bridgestone Americas Inc. with a little over 6,000 workforce, has injected more than $1 billion USD into the Liberian economy through government taxes, salaries and pensions, local purchases and rubber purchases from local farmers, and has spent over $75 million in providing free education, healthcare, housing and security. Only return the topic.
Firestone Liberia's Economic Contributions and Social Services in Liberia