If there were an additional trophic level in this figure that consisted of organisms that prey on snakes, about how much energy would be available to organisms at that trophic level? 
Definitions:
Nominal GDP
The market value of all final goods and services produced in a country in a given period, measured in current prices.
GDP Deflator
An index measuring the change in prices of all new, domestically produced goods and services in an economy.
Real Output
The total value of all goods and services produced in an economy, adjusted for inflation, reflecting the actual productivity rather than nominal figures.
Government Purchases
These refer to the total expenditures for goods and services by all levels of government, excluding transfer payments.
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