We have previously suggested that Kant's categorical imperative can be thought of as an algorithm, a process to determine if a proposed course of action is morally acceptable. This is most clear in the first formulation.

Imagine that you have just bought a new book and are about to write your name on the inside of the cover. Let us suppose the maxim of your action is, 'When you buy something new put your name on it'. To see if this is morally acceptable you apply the first formulation of the categorical imperative. Step through the slides to follow the reasoning.

You will notice that the final step says it is permissible. It doesn't say it is compulsory. The only time the categorical imperative says something is compulsory is when all the alternatives are ruled impermissible. You will recall that Kant says you must never tell a lie. This isn't the same as saying you must always tell the truth. You are only required to tell the truth if all the alternatives are impermissible. If your only options are telling a lie or telling the truth, since you must not tell a lie, you would then be required to tell the truth.

 

 

 

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