Tradeskill work can have a "quality appraisal" by the customer. A good car shop, a good painter, a good gardener. Code by an individual programmer is more diffi

Tradeskill work can have a "quality appraisal" by the customer. A good car shop, a good painter, a good gardener. Code by an individual programmer is more difficult to appraise. Tradeskills are also not scalable.