e$.$ Explain in one paragraph how the PPF curve itself in Diagram $1$ depicts the economic problem of scarcity for Rosie$$s Bakery. $(5$pt$)$

f$.$ Which points in Diagram $1$ represent efficiency? Explain. $(5$pt$)$

g$.$Every point on the PPF in Diagram $1$ involves a trade$-$off.$$ Explain this by comparing a combination of related changes in values on the graph. $(5$pt$)$

h$.$ From Diagram $1,$ calculate the opportunity cost of ONE additional cake in the range $8$ to $12$ with the opportunity cost of ONE additional cake in the range $12$ to $14.$ Show all calculations. $(10$pt$)$

i$.$ In Diagram $2,$ how would explain the shift from PPF$1$ to PPF$2$ at Rosie$$s Bakery using economic theory? $(5$pt$)$