Industry$-$Specific Ratios Specialized ratios are sometimes used in specific industries. For example, the so$-$called book$-$to$-$bill ratio is closely watched for semiconductor manufacturers. A ratio of $93$ indicates that for every $$100$ worth of chips shipped over some period, only $$93$ worth of new orders were received. In October $2020,$ the North American semiconductor equipment industry's book$-$to$-$bill ratio was $\mathrm{.}97,$ down from $1\mathrm{.}19$ in April $2020.$ What is this ratio intended to measure? Why do you think it is so closely followed?