1. British industries got engaged in producing and supplying war needs. So they stopped exporting British goods for the colonial market in India.
2. India got a golden opportunity to fill up their home market with indigenous products.Industrial production increased in India.
3. Indian industries were instructed by the British to produce and supply war goods like cloth for army uniform, jute bags, horse and mule saddle etc.
4. The demand for Indian products raised and new industries were set up and old ones got a boost too.
.. Employment opportunities increased and many got jobs in the industries and worked longer for more production.