This allowed Folding@home to run biomedical calculations that would have been otherwise infeasible computationally. The hybrid design would theoretically ameliorate the problems, but would be complex and possibly infeasible. A linear program can also be unbounded or infeasible. Bootlegging at the time was economically infeasible. These severely restrict capacity and make PRT systems infeasible. A LP can also be unbounded or infeasible. It should be financially infeasible to do so. For example, certain tests may be infeasible or technically difficult. However, it makes classic marginal cost pricing completely infeasible. The idea was first raised during "" development, but contemporaneous hardware restrictions made it infeasible. For climate activists, it is infeasible to decouple hope from fear. Airborne ELF was tested but considered infeasible. However, normal wear and tear proved this system to be generally infeasible. Such methods did not account for any resources, and would produce infeasible schedules. A break can thus include results that are infeasible with current technology.