Economists use various methods to measure physical capital in a country, with a focus on quantifiable assets that contribute to production. Among the options you provided, the following methods are commonly used to assess physical capital:
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The amount of roads and bridges per capita: This reflects the infrastructure of a country and is a direct measure of physical capital, as roads and bridges are essential for transportation and logistics.
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The number of telephones it has in relation to its population: This can be an indicator of communication infrastructure, which is also considered a part of physical capital.
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The number of computers that are available to businesses: This also represents an aspect of physical capital, particularly in industries that rely heavily on technology.
The option regarding the amount of savings that the citizens have in the bank is generally related to financial capital rather than physical capital.
In summary, all the options except for savings pertain to ways economists might measure aspects of physical capital in a country, but the most direct measures would be the amount of infrastructure (roads and bridges) and the number of computers available for business use.