A couple goes to the civil affairs bureau to file for divorce.

The staff ask: “Why do you want to get divorced?”
The man says: “Because you think I spend too much money.”
The woman says: “I earn some money, but it all gets squandered by him.”
The staff ask: “Where did the money all go?”
The wife says:
“A small path leads to the mountaintop
Carrying boxes, we go up
Only by the combined efforts of three people can we lift it
Once it’s lit, it scatters into a puff of smoke.”
After hearing this, the staff member is instantly stunned:
“What does that mean?”
So, what does that mean?