I agree that there has never been a completely free market economy, and submit that there never can be. But that wasn't the topic.

I think that you do not want to acknowledge the concept of externalization. If so, then you obviously can't explain how Classical Liberalism deals with it. I think it deals with externalization of economic costs by refusing to acknowledge that it exists. Therefore, I can see how you might well be a Classical Liberal.

BTW, a Classical Liberal has virtually no relation to a Contemporary Liberal, in case anyone was wondering.
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“You never change things by fighting the existing reality.
To change something, build a new model that makes the old model obsolete.”
– R. Buckminster Fuller