You should be honest in your business dealings.
Elon is the founder of an electric car company and is presenting his company to potential investors.
Elon wants more money to work with.
Elon tells the investors what his goals are and what he's going to do with any money he receives.
Elon tells the investors that his revenue is 10% higher than it actually is.
The investors are more willing to invest in his company and want Elon to succeed.
The investors find out eventually that Elon lied and want to sell their shares.