  GDP of China is about 11 trillion dollars and GDP of the United States is
about 18 trillion dollars. Suppose that we know for the coming years, economy
of the US will experience a real growth rate equal to \%3 and economy of China
will experience a real growth as of \%6. Now, the question is how long does it
take for economy of China to catch the economy of the United States. The early
impression is that the desired time is the answer of the equation
$11\times1.06^X=18\times1.03^X$. The correct answer however is quite different.
GDP is not a simple number and the gap between two countries can not be
addressed simply through their sizes. It is rather a geometrical object.
Countries pass different paths in the space of production. The gaps between GDP
of different countries depend on the path that each country passes through and
local metric. To address distance between economies of China and of the US we
need to know their utility preferences and the path that China passes to reach
the US size. The true gap then can be found if we calculate local metric along
this path. It resembles impressions about measurements in the General Theory of
Relativity. Path dependency of aggregate indexes is widely discussed in the
Index Number Theory. Our aim is to stick to the geometrical view presented in
the General Relativity to provide a visual understanding of the matter. We show
that different elements in the general relativity have their own counterparts
in economics. We claim that national agencies who provide aggregate data
resemble falling observers into a curved space time. It is while the World Bank
or international organizations are outside observers. The vision provided here,
leaves readers with a clear conclusion. If China keeps its growth rate, then
the economy of China should catch the economy of the United States sooner than
what we expect.
