ABSTRACT: Since the foundation of the Asian Infrastructure Investment Bank (AIIB) there have been a lot
of debates amongst politicians and academics on the Bank‘s objectives. Although these debates inform a lot
about the AIIB, they lack a theoretical support and therefore sequential explanation. This is to say those
criticizing the AIIB as a China‘s tool to carry out relative gains anchored on China‘s great institutional power
assumption cannot demonstrate evidence that it is really funneling its objectives through the AIIB. In turn, those
praising China‘s initiative of creating the AIIB as an indication of its willingness to participate in the
international system under the current rules as a way to ensure absolute gains, also present shortcomings to
explain why China controls the organization more than would be expected if it really wanted to be constrained.
Then, both the accusations against the AIIB and praises to it do not stand up to close scrutiny. This article finds
out that there is an alternative offshoot of realism, here called realism institutional that narrow this gap by
handling a very important concept - institutional power -, which is neglected by the mainstream theories,
neorealism and neoliberal institutionalism. From this theoretical account, China possesses the institutional power
in the AIIB contrary to the neoliberal institutionalism prospect, albeit is not using it in the way would be
expected by neorealism assumptions. This finding throws some theoretical light on the apparent contradiction on
why China is seeking for bigger institutional power and at the same time is embracing self-constraint in the
AIIB. In fact, the AIIB makes part of China‘s charm policy of backing the absolute gains while seeks for relative
gains.
KEYWORDS:The AIIB, institutional power, realism institutional, absolute and relative gains.