A producer of tinned beans introduces mechanisation to its assembly line. As a result, output rises by $30\%$ and labour falls by $20\%$. How and why will this change supply curve $S$?
- A$S$ will move to the left due to an increase in average costs.
- B$S$ will move to the left due to an increase in the price of tinned beans.
- C$S$ will move to the right due to an increase in consumer demand.
- D$S$ will move to the right due to an increase in productivity.