Mass Production and Continuous Flow Manufacturing 

Continuous systems lie at the other extreme, where demand for a single product is sufficiently high to warrant the installation of highly specialised automatic production lines. With their very high rates of output and very low manning levels, unit costs are typically very low. Such systems generally have little flexibility. Where the entities produced or serviced are discrete items (eg car manufacture, processed photographic films) the term mass production is used. The term process industry refers to systems which produce a continuous output (e.g. petroleum products, chemicals, cement).