An increase in the wage rate of workers in a cassava processing factory in Nigeria will, all other things being equal, cause

An increase in the wage rate raises the cost of production for the cassava processing factory. Higher production costs reduce the profitability of supplying processed cassava at every price level, causing the supply curve to shift leftward (decrease in supply). This is a change in a non-price determinant of supply, so it shifts the entire curve rather than causing a movement along it.