Answer:
Principle of replaceability
Step-by-step explanation:
According to the machine metaphor it is necessary to have standardization in all the processes and products , The replaceability principle is applied to a machine when a component gets damage it can be easily replaced for another equal component because those are standardized.
Under this principle, the same happens with the workers of a company, if a worker left the job, he can be easily replaced for another worker. In the case of Horace, if a worker leaves the job he has many other options to replace the worker and do the same job.