Why compare a broad category like arts with narrow category like agriculture?
Why not compare something general like arts and with something general like food? Could it be because the contribution of the food industry dwarfs the arts industry? Or compare something specific like "instrument market" with something specific like agriculture?
Also, isn't contribution defined by how we arbitrarily choose to measure it? Do we ( or should we ) assign the value or portion of the value of the goods transported to the transportation system?
Why not compare something general like arts and with something general like food? Could it be because the contribution of the food industry dwarfs the arts industry? Or compare something specific like "instrument market" with something specific like agriculture?
Also, isn't contribution defined by how we arbitrarily choose to measure it? Do we ( or should we ) assign the value or portion of the value of the goods transported to the transportation system?