The biggest cost of an EV is its battery. Battery pricing trends are downwards...
Lithium-ion battery pack prices, which were above $1,100 per kilowatt-hour in 2010, have fallen 89% in real terms to $137/kWh in 2020. By 2023, average prices will be close to $100/kWh
ref https://about.bnef.com/blog/battery...20-while-market-average-sits-at-137-kwh/

M3W5sp 2015, MSCC, MTWC, Oxon UK