Answer:
Growth in labor force
Improved pizza-making technology
Step-by-step explanation:
Production possibilities frontier (PPF) is the various ways or possible ways (combination) whereby two goods that can be produced in a certain period of time under the conditions of a given state of technology and well equipped resources. Productive efficiency of a goods is the condition where the maximum output is produced with the already laid down resources and technology available. It is said to be a curve that depicts the maximum quantity of one good that can be produced for each maximum number or quantity of another good produced.