The line with equation y = x is shown on this plot as the solid line. What is the key difference between points above this line and points below the line? Which city had the largest increase in rice...

The line with equation y = x is shown on this plot as the solid line. What is the key difference between points above this line and points below the line?

Which city had the largest increase in rice price? Which had the largest decrease in rice price?

The ols line
  is shown on the figure as a dashed line, and evidently
  Does this suggest that prices are lower in 2009 than in 2003? Explain your answer.