These problems have very little to do with short-term or even medium-term budget arithmetic.

这些问题与短期或者甚至中期预算的计算几乎没有关系。

youdao

Most of the debate has concentrated on their long-term arithmetic: they think that Japan's population is bound to stabilise at some point, perhaps around 2060, and that Japan will therefore be able to ease the demographic transition by spreading the costs over the course of a century or more.

ECONOMIST: Japan

The aggregate long-term gain for rich and poor countries alike is likely to be far bigger than the simple arithmetic would suggest.

ECONOMIST: Profits over people