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One way to reduce costs is to accept lower levels of service in exchange for lower costs. In GCP there are a number of opportunities to reduce cost in exchange for lower levels of service, including the following:

 Using preemptible virtual machines instead of standard virtual machines

 Using standard tier networking instead of Premium tier

 Using Pub/Sub Lite instead of Pub/Sub

 Using Durable Reduced Availability Storage

These examples are representative of the kinds of trade-offs we make when opting for a lower-cost service.