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Absolute advantage is when one country can use fewer resources to produce a good compared to another country.

The forgone benefit that would have been derived from an option not chosen is the opportunity cost.

Brazil has the absolute advantage in beef as it can produce $100$pounds of beef as compared to$40$pounds of beef.

The United States has the absolute advantage in producing autos as it can produce$30$autos as compared to$10$autos.

The opportunity cost of producing one pound of beef in Brazil is sacrificing the production of $\frac{1}{10}$of autos.

$$\begin{gathered} 100beefs=10autos \\ 1beef=\frac{10}{100} \\ =\frac{1}{10}autos \end{gathered}$$

The opportunity cost of producing one pound of beef in the United States is sacrificing the production of $\frac{3}{4}$of autos.

$$\begin{gathered} 40beefs=30autos \\ 1beef=\frac{30}{40} \\ =\frac{3}{4}autos \end{gathered}$$