Economist: Although average hourly wages vary considerably between different regions of this country, in each region, the average hourly wage for full-time jobs increased last year. Paradoxically, however, in the country as a whole, the average hourly wage for full-time jobs decreased last year. Which one of the following, if true of the economist's country, most helps to resolve the apparent paradox in the economist's statements? ['In the country as a whole, the average hourly wage for full-time jobs has decreased slightly for each of the last three years.', 'The year before last, the unemployment rate reached a ten-year low; last year, however, the unemployment rate increased slightly.', 'Last year, to reduce costs, employers moved many full-time jobs from regions with relatively high hourly wages to regions where those jobs typically pay much less.', 'Last year, hourly wages for most full-time jobs in the manufacturing sector declined while those for most full-time jobs in the service sector increased.']