[Question] Why would GDP X GDP Per Capita be used as a measurement of power? What’s the purpose of squaring GDP?

I read this article as I was getting interested in war stuff, given what’s going on in Ukraine right now: The Power of Nations Measuring What Matters.

I was wondering why in War and Dispute Outcomes, 1816–2010, Table 2, GDP X GDP per capita is used as an indicator of measuring successful outcome predictors. Mainly, what is the significance of squaring the GDP part of this particular indicator?

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