India's infrastructure was underdeveloped at independence, hindering economic growth. Key factors for fast economic growth include natural resources, capital, skills, technology, supportive government policies and infrastructure development. However, poor port and road infrastructure as well as differing tax structures between states negatively impact India's competitiveness globally and the sustainability of its markets. In the late 2000s, India's growth reached 7.5% annually, which could double average incomes within a decade if further market reforms were implemented, but infrastructure bottlenecks remain an obstacle to sustaining high growth rates.