The objectives of the paper are twofold: to review valuation methods for plant genetic resources and to develop methods to estimate the past and potential future benefits, both domestic and international, of existing germplasm collections in Papua New Guinea (PNG). The analysis concentrates on...

Where a fish stock straddles or migrates between country A's exclusive economic zone (EEZ) and country B's EEZ, or the high seas, vesting ownership rights in the stock with A does not ensure efficient harvesting of the stock. This problem arises in the case of migratory tuna stocks in the...

The consequences of carryover for the optimal application of fertilizer are considered using dynamic programming. The conclusions are relevant for the further problem of deciding how many grain crops to harvest from grain sorghum plants grown in a tropical environment. Dynamic programming is...