The article appears to credit Tesla, but Tesla built the gigafactory with Panasonic. And Panasonic had invested, and received massive investment from the likes

The article appears to credit Tesla, but Tesla built the gigafactory with Panasonic. And Panasonic had invested, and received massive investment from the likes of Apple for years before. Also, note that the Gigafactory was built in 2014 but prices were dropping well before. The far more likely cause for the decline of batter prices (and why I had predicted they would decline in the early 2010s) was the massive investment by consumer electronics, and particularly smartphone makers, in better and cheaper battery technology. Elon Musk's best move was taking advantage of the investments the smartphone industry was putting into reducing battery costs.