If it costs $90 to deliver a day's energy to a customer, they can charge $100, making $10 profit per customer-day. If it costs $900 to deliver a day's energy t

If it costs $90 to deliver a day's energy to a customer, they can charge $100, making $10 profit per customer-day. If it costs $900 to deliver a day's energy to a customer, they can charge $1000, making $100 profit per customer-day. Where is the incentive to reduce expenses if the only way you can raise profit is by raising expenses?