The Asian Development Bank (ADB) has recommended that ASEAN governments should aim for a public-private financing ratio of one public dollar to an “early double-digit” amount from the private and institutional sectors for infrastructure development. The ADB believes this ratio could provide enough resources to close the region's significant infrastructure investment gap. Currently, governments' fund sourcing averages three dollars for every one invested. The report took stock of the latest innovative financing approaches deemed crucial to private sector participation, with inputs from finance ministers and central bank governors of Asean+3 economies. The infrastructure funding gap is USD2.5tr a year, with the private sector expected to cover at least 70% of the funding needed.