Table 8 shows that different costs are incurred in different countries. The lower labour cost in Tanzania contributed to the lower harvesting cost. However, the development of Jatropha using manual harvesting and the traditional dehulling method becomes impractical for a large scale plant and in the countries where the labour cost is relatively high such as Malaysia, Belize, Brazil, etc. The production of Jatropha biodiesel should be effective and low cost so that the Jatropha can be a sustainable alternative for fossil fuels. Henning [47] stated that the economy of the oil is very much dependent on the price of the seeds. The reduction in the price of the seed from US$0.10 to US$0.08 per kg can decrease the price of the crude oil from US$0.83 to US$0.67 per litre [47]. As a result, the process of mechanisation has become the primary development trend to reduce the seed cost in the Jatropha biodiesel industry. On the other hand, one of the best means of reducing cost is to combine the steps in the various operations [83]. Therefore, simplification using a single machine, using low cost components or combining two machines might be a further trend for the purpose of saving production space, material handling time, reducing labour requirement and reducing the maintenance cost. This is to make the feedstock preparation economically feasible and market-competitive [29].