Ask him his source.
IDR1b with today Exchange rate is US$67,370.35
I believe he is either Mr. Know-it-all (sok tau) or feeding you porkies.
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"The
median salary in Indonesia is 11,400,000 IDR (788 USD)"
This is
Median salary/Income, Not Mean or Average. The median in statistics is the value in the middle of a data set, meaning that 50% of data points have a value smaller or equal to the median and 50% of data points have a value higher or equal to the median.
So this means that 50% of the Indonesian population earns more than 11,400,000 IDR, and the other 50% earns less than 11,400,000 IDR.