| Čoahkkáigeassu: | A productive and economic analysis was conducted on a sample of 184 logs of lenga (Nothofagus pumilio) from Monte Alto Land, XII Region, Chile. Logs were allocated to produce select (S), regular (C1, C2 and C3), and short lumber qualities. The productive efficiency analysis was done by production stochastic frontiers Cobb-Douglas and Translog. This approach is based on production functions and generates technical efficiency measures (EFt) to assess production systems. Logs attributes used as inputs were small end diameter, length and process productivity. The average EFt values of logs were 0,85 and 0,78 calculated by Cobb-Douglas and Translog frontiers, respectively. These measures imply that, on average, the logs could use reduced attributes by 15% or 22% and still achieve the same output. The most efficient logs (EFt ≥ 0,9) were characterized by obtaining an average small end diameter of 33 cm, and an average recovery value of USD 33 m-3 and 29 m-3, for Cobb-Douglas and Translog frontiers, respectively. There were significant positive correlations between efficiency and the logs recovery values (r = 0,53; p ≤ 0,05).
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