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Right.

My friend is refactoring an app at his company right now, using only Lambda via JAWS and we ran some numbers on the cost savings. He's retiring 2 EC2 c3.large instances which were costing $2.97/day. On Lambda the app will cost $0.05/day.

We don't hear about it nearly enough yet, but the cost savings of building apps on Lambda are huge. Then you add in the time saved on devops... and you realize how seriously disruptive this tech is.

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Yes, this is the key point of microservices: it's not the modularity, nor cross-language nor "webscale" etc.

It's cheaper, because more efficient use of resources, because finer-grained. Each component of an app only gets what it needs; and the vendor can sell that unused capacity to someone else.

Geometrically speaking, finer grains pack tighter, wasting less space.

They also utilize multi-core effectively.

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