I knew I wasn't going to ace economics class,

[No. 1 son]

but it still eludes me. MIL's tractor is running rough, and I was going to rebuild the carb, it's about 6 years old and doesn't run much. Rebuild kit ( gaskets, float needle, air/fuel mix screws) costs $18. New replacement carb costs 24$. I guess it's offshore labor. 

[minx]

I got lost when they moved the oil filter to a place where only a tiny-handed, long-armed person could reach it while the car wasn't on a lift.