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Question 18 2 pts Consider the simple Romer model presented in class. The model does NOT provide adequate explanations for which of the following? Select all that apply. [ Why researchers' productivity differs across countries How the share of researchers in an economy affects growth How the number of workers in an economy affects growth What determines how workers are allocated into the industry (and produce output) or into research (and produce ideas). Question 19 2 pts An economy follows the combined Romer-Solow model, and it is currently on its balanced growth path. Suppose there is an exogenous increase in the saving rate s. How do you expect the economy to evolve over time? The growth rate of output per capita immediately rises. Over time, the growth rate declines until eventually it returns to the growth rate of the initial balanced growth path. The change in saving rate has no impact on the growth rate or on the level of per capita output at any time. The economy will continue on the same balanced growth path. The growth rate of output per capita immediately falls. Over time, the growth rate of per capita output increases and eventually the economy will reach a balanced growth path with a higher growth rate than the original one. O The growth rate of per capita output immediately increases. Eventually, over time, the economy reaches a new steady-state level of per capita output. O The level of per capita output immediately decreases, but the growth rate of output per capita remains the same