help me answer this questions in a concise manner and please don$$t use AI$.$

$-$ Discuss how companies can use: $($a$)$ product differentiation, and $($b$)$ capacity control to manage rivalry and increase an industry$$s profitability.

$-$ What kinds of strategies might: $($a$)$ a small pizza place operating in a crowded college market, and $($b$)$ a detergent manufacturer seeking to unveil new products in an established market use to strengthen their business models