True, False, or Uncertain. Please declare whether each of the following statements is True, False, or Uncertain. Provide a short justification for your answer.

1. A model with capital accumulation but no technological change predicts that output per worker will fall over time.

2. Productivity growth is bad for low-skilled workers.

3. Okun's Law says that a decrease in the natural rate of unemployment raises the growth rate of potential output.

4. The Philips-Curve relation says that inflation tends to rise when the rate of growth of actual output exceeds the growth rate of potential output.