$(3$ pts$)$ Recall that a Cobb$-$Douglas production function has the form

$P=c{L}^{}{K}^{},$ with $c,,>0.$

Economists talk about

increasing returns to scale if doubling $L$ and $K$ more than doubles $P,$

constant returns to scale if doubling $L$ and $K$ exactly doubles $P,$

decreasing returns to scale if doubling $L$ and $K$ less than doubles $P.$