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Under a system of perfectly free commerce, each country naturally devotes its capital and labour to such employments as are most beneficial to each. This pursuit of individual advantage is admirably connected with the universal good of the whole. By stimulating industry, by regarding ingenuity, and by using most efficaciously the peculiar powers bestowed by nature, it distributes labour most effectively and most economically.
- David Ricardo
C1: morality as understood by empiricists is a posterori (this morality would be relative)C2: however, this can only tell us how humans do act, not how they should actC3: therefore all morality must be a prioriP1: therefore morality is objectve
On the contrary, it assumes that morality is a posterori and shows why this is absurd.
That's a more reasonable critique, but the purpose of morality as understood by Kant, is indeed to make value judgements (normative statements). If it doesn't do that then it's useless. Therefore, in order for morality to have purpose it must make normative statements.