Speaking at a news conference to kick off the bank's annual meeting, he said there is a massive need for infrastructure spending in Asia and ADB and AIIB can cooperate by co-financing good projects together.
ADB and AIIB agreed to co-finance three projects -- two last year and one this year, he said. The two projects co- financed are among the 12 that AIIB has approved since 2016.
Japan and the US did not join the USD 100-billion China- backed Asian Infrastructure Investment Bank (AIIB), which now has 70 approved members.
ADB, he said, is doing policy based lending and social sector support in addition to infrastructure.
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"So we have different kinds of objectives and different ideas of management. I had nine discussions with (AIIB) President Jin (Liqun) in last two years to discuss co- financing projects.
"We agreed to three projects, two last year, one this year and we also discussed how we can use local currency for co-financing. So, there are many areas in common where we can cooperate," he said.
"If you include China and India, ADB support 3 per cent of infrastructure financing. The financing need is so large that we don't need to regard them (AIIB) as rival.
"In this regard, because there is a very large piece of financing, so we can cooperate. I don't think we need to change our business model.
"We will continue to support social sector besides infrastructure," he added.
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