Tesla$-$five forces that impact this industry.

$1.$ Threat of New Entrants

Example: The emergence of new electric vehicle $($EV$)$ startups like Rivian and Lucid Motors. These companies are entering the market with innovative technologies and substantial financial backing, posing a potential threat to Tesla's market share.

$2.$ Bargaining Power of Suppliers

Example: The reliance on specialized battery suppliers such as Panasonic. Since batteries are a critical component of electric vehicles, suppliers can exert significant influence over Tesla, especially if there are few alternative sources for high$-$quality batteries.

$3.$ Bargaining Power of Buyers

Example: Consumers' increasing demand for more affordable electric vehicles. As more competitors enter the market, buyers have more options to choose from, which can pressure Tesla to lower prices or offer more features to maintain its customer base.

$4.$ Threat of Substitute Products or Services

Example: The availability of traditional internal combustion engine $($ICE$)$ vehicles and hybrid vehicles. Although the trend is moving towards electric vehicles, ICE and hybrid vehicles still serve as substitutes, especially in regions where EV infrastructure is underdeveloped.

$5.$ Industry Rivalry

Example: Intense competition from established automakers like Ford, General Motors, and Volkswagen, which are increasingly investing in their own electric vehicle lines. This rivalry forces Tesla to continuously innovate and improve its products to stay ahead in the market.

In the examples given, what was the main difference between a "rival" and a "substitute?"