The public sector in India refers to government-owned corporations where the central or state government holds a majority (51% or more) of the paid up share capital. Zero-based budgeting requires all expenses to be justified for each new period by analyzing the needs and costs of every function within an organization, starting from zero rather than using the previous budget. It was introduced in India in 1986-87 by then Finance Minister V.P. Singh to address issues of mounting non-plan expenditure and declining public savings dominated by defense spending, interest payments, and subsidies.