Why SoC(system-on-chip) not used in PC but dominant in smartphones?

Given the high volume of PCs, why don't PC manufacturers think of using SoC(system on chip) to lower their cost? SoC is cheaper and is dominant in smartphones, but why are smartphones more expensive than PCs in terms of computing power per dollar?

Given the high volume of PCs, why don't PC manufacturers think of using SoC(system on chip) to lower their cost?

They do, but are the equal in performance etc. Replacing them means more than just replace a chip, you need to replace production lines, contracts, other components etc

SoC is cheaper and is dominant in smartphones, but why are smartphones more expensive than PCs in terms of computing power per dollar?

Are they?

We as end consumer pay more but that is always the case for new innovative products, the margin made is for paying the innovation research (and stakeholders of course)

check this book - The Innovator's Dilemma: The Revolutionary Book That Will Change the Way You Do Business: Christensen, Clayton M.: 8601300047348: Books -

lightaiyee:
Given the high volume of PCs, why don't PC manufacturers think of using SoC(system on chip) to lower their cost? SoC is cheaper and is dominant in smartphones, but why are smartphones more expensive than PCs in terms of computing power per dollar?

Lots of reasons.

SoC generally isn't cheaper, but its volume is much less. PCs aren't usually limited by space.

Margins on phones are much higher than PCs because Smartphones are generally subsidized.

PCs are generalized in their architecture, making it difficult to get a high volume of SoCs.

PC makers prefer having modularity down to the chip level to reduce potential costs.

Smartphone volumes are higher than PCs.