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PER CAPITA OUTPUT YEAR In the Romer model in the figure above, at time to, a change in the growth rate of per capita output can be explained by: (select all that apply) An increase in the population O An increase in the productivity of researchers An increase in the research share, the fraction of the labor force allocated to producing ideas O An increase in the fraction of the labor force allocated to producing output A decrease in the population An exogenous increase in the stock of knowledge of the economy