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This study analyzes the costs incurred on an intensive silvopastoral system (ISS) based on Leucaena leucocephala on gravity fed irrigation soil, and the economic benefits that are generated in this type of systems, all this in order to evaluate the economic profitability of the investment and to make a comparison between the ISS and the conventional ones (40% grass monoculture Tanzania Panicum maximum, 30% of forage sorghum sorghum vulgar under a cutting system and 30% of rangeland with native grasses). The feed for dual-purpose Swiss cattle was complemented in the ISS with polished rice at the rate of 1.50 kg/ day per cow during milking, while the traditional system used 3.50 kg/day of commercial feed by milked cow. The results showed an Internal Rate of Return (IRR) for the ISS of 13.30% and a Net Present Value (NPV) of 10% with a positive balance of $2'202,170 (Mexican pesos) while the traditional system obtained an IRR of 0.7% and a NPV of 10% with a negative balance of -4'717,022 (Mexican pesos). When switching from the conventional system to the ISS the productivity and profitability of the ranch incremented and turned it into a lucrative business. [ABSTRACT FROM AUTHOR]

This article is the result of a research that develops a model related to the determination of the rent on a leasing vehicle contract and the valuation of the call option that gives the lessee the right but not the obligation to buy the used car at the end of the contract at a specified price. We used models proposed by [1] and by [2] in three brands of vehicles in Colombia for the period between January of 2004 and December of 2007. The analysis of the time series of returns of the prices vehicles displayed an ARMA process. We also developed further tests to identify possible ARCH effects in the series of returns of prices of the vehicles analyzed. The estimation of the value of the option to purchase the vehicle at the end of the leasing contract is done by the implementation of the model of Black Scholes and Montecarlo Simulation. [ABSTRACT FROM AUTHOR]

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