The 2x4 Test (Does It Blow You Away?)
A great business hits you in the head with a 2x4 — usually because one input in the equation is free or anomalous.
The filter for whether a business is great: does it instantly blow you away? Great businesses almost always have one part of the equation that is different from the mainstream — typically a near-free input. The same business is fantastic or terrible depending on whether you got that input at an anomalous price.
- Ask: does this model hit me with a 2x4? If you have to argue for it, it isn't one.
- Find the part of the equation that is free or priced anomalously.
- The same business is great or terrible based on that single input's cost.
At ~16, Buffett and Don Danley bought broken pinball machines for ~$5, fixed them for a few dollars of parts, and placed them free in DC barber shops under a fictitious "Mr. Wilson," splitting the coins 50/50. The free/cheap machine made the return on capital effectively infinite; the same machines bought at list price would have been a terrible business.
Teenage Buffett's pinball route: machines bought broken for ~$5 and fixed for parts, placed free in barber shops on a 50/50 split — infinite return on capital. The identical business buying machines at list price "loses your shirt." Same logic as the free golf balls a friend dived for, and as Level 3's bonds.