The following diagram represents Jamie\'s Restaurant\'s production possibilities frontier curve for two goods: vegan pizza and chicken wings. If the cost of poultry (chicken) increases, then the PPF will most likely shift: rightwards along the horizontal axis only upwards along the vertical axis only downwards along the vertical axis only leftwards along the horizontal axis only Solution The PPF will shift leftward along horizontal axis. This is because with same reosurce the production of chicken wings will fall. The answer is option 4..