Consider two countries, country A and country B, and only one product, avocado. In country A, demand and supply function

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Consider two countries, country A and country B, and only
one product, avocado.
In country A, demand and supply functions are given as:
Da = 100 – 2 Pa
Sa = 40 + Pa
Where Da: demand in country A; Sa = supply in country A; Pa =
price in country A.
In country B, demand and supply functions are given as:
Db = 150 – Pb
Sb = 60 + Pb
Where Db: demand in country B; Sb = supply in country B; Pb =
price in country B.