The China-led Asian Infrastructure Investment Bank (AIIB) will be lean, clean and green, its interim chief said, playing down concerns over transparency and standards governing the institution. The AIIB is seen as a potential rival to established lenders the World Bank and Asian Development Bank, which are dominated by the United States and Japan. “AIIB is a bank, not a political organization or political alliance. More than 40 countries have applied to join the AIIB, with the United States and Japan being notable absentees.