需要把personal 和 business 两个事情分开考虑

because he's not chinese, I type my advice in English. 

It is always risky to combine personal affairs with business.  A business deal has to be evaluated on its investment and return alone, It's a good deal or bad deal, simple.  If you mix in personal gains/loss, often times you'd misjudge a bad deal as a good deal. 

The boy's deal is not common.  However, a really common example is buying a vacation beach rental, the plan is you can use it for beach vacation and rent it out when you are not at the beach.  While a beach vacation investment and return can be easily calculated by itself, many people mistakenly added their "money saved staying at beach hotel" into the calculation, thinking that as long as they added the money saved the deal make sense.  

This would be a mistake.  Things change, maybe you'll rarely go to that beach location, maybe your friend's son and his friends got other jobs or got married and they couldn't live in that house.  Then they'll find out the deal might be a bad deal when they cannot save rent money anymore.  

So the advice is, take out the personal rent saved, and evaluate the deal on business alone.  Is it good or bad.  Only do it when the business can stand on its own. 

所有跟帖： 

• 柠檬说的非常好！ 很多人把p 和b 混起来还浑然不知已经烦了大错 -子非鱼焉- ♀ (0 bytes) () 01/19/2023 postreply 13:05:00

• 谢柠檬回答. 所以说他们应该先算算房子修复需要的时间和花费？而五个人每月省下的rent不能算? -鲤鱼洲- ♀ (81 bytes) () 01/19/2023 postreply 13:44:08

• 要算好几笔帐 -柠檬椰子汁- ♂ (514 bytes) () 01/19/2023 postreply 13:50:33