Have a product or service that can substitute. Which customers can switch to substitute without additional cost high. The business risk to maintain a profit, that may change.
A product or service that can replace it. Which can be used instead. Without additional costs high. Business is risky to keep profits stable. This may change at any time.
The goods or services can be replaced. Which customers can change). Without additional cost is high. The business was vulnerable to maintain profit to be constant. It may be changeable.