"lessen cost" is a correct and usable phrase in written English. It means to reduce or decrease the cost of something. Example sentence: By streamlining our production processes, we were able to lessen the cost of the product.
Moreover, this design of simple generator which can easily drive without a geared mechanism, lessen cost and the complexity of the system by reducing the quantity of driving components.
In second term variable cost of transportation is considered, but we should lessen cost of returning external vehicles that we take into account in term 2. In term 4 we consider fixed cost of opening treatment facilities in potential locations and in term 5 cost of opening depots is considered.
Of course, you have to pay good, if you want good quality services, however outsourcing project to some professional software development firm may aid you lessen cost, yet obtain quality solutions.
The days of big pharmaceutical companies owning many manufacturing plants are slowly ending, and every company, no matter what size, is looking for ways to lessen costs to survive in an increasingly tough and unpredictable economic climate.
Now, many companies are fast upgrading their technology and moving up into second- and first-tier cities, while foreign firms, trying to lessen costs, are moving down to second- and third-tier cities.
Also, the inclusion of future health system costs in our model will slightly lessen cost-effectiveness (scenario analyses about excluding unrelated health system costs show little impact, see Table 4) and our use of a cohort (rather than a population-wide) model may have influence.
The lost opportunities for providing effective services for the disadvantaged patient groups may lessen cost-effectiveness of the health care systems as a whole, but also of any particular health care provider who fails to provide effective services for the whole population which it serves.
Ludwig does not simply clarify my doubts with English writing, it enlightens my writing with new possibilities
Simone Ivan Conte
Software Engineer at Adobe, UK