The failure was to give the numbers a sanity check. Being off by a factor of 10 is bad enough. Off by a factor of 100 (very roughly the dollar/yen exchange rate) is a whole different order of magnitude.
Actually, the failure was to redo your analysis as though there was any worth to it at all. When you are analyzing a company or industry and you are off by a couple of orders of magnitude on the most important number, it means you have no understanding or feel for the business. You should just stop before you make things worse.
In this case it’s just fooling around, so I suppose it doesn’t matter.
But seriously, do you not understand that Tesla’s vehicle business is going to generate more profit for them than Toyota’s will by next year? And likely more profit than the entire cast of legacy manufacturers a couple of years after? Exponential growth is like that. Especially coupled with the shrinking sales of those other manufacturers.
-IGU-