Final answer:
Using the formula Velocity = nominal GDP / money supply, and given the nominal GDP of $840 billion and money supply of $140 billion, the velocity of money in this scenario is 6.
Step-by-step explanation:
The question relates to the concept of the velocity of money, which is an economic term that represents the frequency with which the average unit of currency is used to purchase newly produced goods and services within a given time period. To find the velocity of money, we use the equation Velocity = nominal GDP / money supply. Given that the nominal GDP is $840 billion and the money supply is $140 billion, the velocity of money would be $840 billion / $140 billion = 6. Therefore, the correct statement is: 'the velocity of money is 6.'