Demand for a good and the price of substitutes

Decreasing demand for coal fired power and increasing demand for solar power in India, reports tutor2u
https://www.tutor2u.net/economics/blog/india-scraps-plans-for-coal-plants-as-cost-of-solar-collapses?utm_medium=email&utm_campaign=Economics%20daily%20digest%20Wed%2031st%20May%202017&utm_content=Economics%20daily%20digest%20Wed%2031st%20May%202017+CID_d90069d2c9e3c8d462d28271d6383abb&utm_source=CampMonitor&utm_term=India%20scraps%20plans%20for%20coal%20plants%20as%20cost%20of%20solar%20collapses%20The%20shift%20towards%20solar%20power%20as%20an%20affordable%20source%20of%20renewable%20energy%20seems%20to%20be%20gathering%20pace%20Economies%20of%20scale%20are%20lowering%20the%20unit%20cost%20of%20solar%20power%20and%20this

or cinema and Netflix/Amazon
https://www.theguardian.com/media/2017/jun/14/netflix-amazon-uk-cinema-box-office-film-dvd-blu-ray-pwc