Question

One reason why Japan has enjoyed economic success is because its workers have a strong _________. tariff work ethic Osaka trade surplus

Answer 1

I assume that these are the options.
the first option, tariff, is a form of tax.
the second option, work ethic, is indeed something the workers can do to improve the economy so this is the correct answer

Osaka is a city and trade surplus would be more an effect than it cause for good economy