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For surplus production models, this function returns the production exponent n corresponding to BMSY/K (Fletcher 1978).
SP_production(depletion, figure = TRUE)
The production function exponent n (numeric).
The hypothesized depletion that produces MSY.
Local, plots figure of production function as a function of depletion (B/K)
Q. Huynh
Fletcher, R. I. 1978. On the restructuring of the Pella-Tomlinson system. Fishery Bulletin 76:515:521.
SP SP_SS
SP_production(0.5) SP_production(0.5)
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