The benefits of encouraging children to work hard together and earn money as a family: 

"One might ask why we do all of these things. The obvious answers are: 

1. all of our teenagers have sizeable missionary funds; 
2. all of our children over eleven know they will have a job; 
3. no Sunday work is involved; 
4. the children have learned valuable skills; 
5. they are learning to budget their resources and to distinguish between wants and needs; and 
6. as their father, I have had many wonderful teaching moments with them as we have worked side by side."

President Dean Jarman

Read entire talk here.