One-sided sustainability tests with amenities, and changes in technology, trade and population

摘要: Abstract If an economy with multiple consumption goods (including environmental amenities) uniquely maximises present value constant discounting, it is unsustainable at some time if either of two measures—augmented net investment, or the change in augmented green national product—are zero negative then. “Augmented” denotes that treated as a productive stock, which includes each measure future, exogenous changes technology terms trade. Adjustments are found to make test for individual sustainability when population grows exogenously. The practical and philosophical rationale testing present-value-maximising, therefore fully prescribed, development path discussed.