Why has Dell been so successful despite the low average profitability in PC industry?

Their business model

Operating costs are low given they have no retial outlets or wholesalers. all sales are on-line only

Innovator in gving consumer choice of the type of PC they wanted. Almost build your own with actualy having too. Competetive pricing.

Quality and reliable product that appealed to corporate sector at comaptible lower costs than from other PC maufacturers.

No product development costs as they only use existing technology.

Instead of posting your homework Qs why don't you head out to the library and actually learn something besides copy and pasting someone else's opinion?