World's Largest Malls according Forbes

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i think the US has 5 malls in the list, correct me if im wrong

Yup but only one in the top ten.

I wonder how forbes measured this.

Is it by
A. land area
B. floor area
C. number of people per squre km. or
D. they made up a certain formula.

Im interested to know how Henry Sy thinks in business. ang galing nya talaga.

It was measured by square feet of gross leasable area. Which means parking doesn't count and as M54 said most of the malls in the US have large parking lots taking most of the space.