Difference between organizations Effectiveness and efficiency?

Effectiveness simply relates to reaching goals...so a company that has captured a 75% market share is very effective. Efficiency relates to how much they needed to spend or invest in relation to their effectiveness...so if two companies each had only a 0.1% rejection rate off the assembly line, they would be equally effective - but if the first company invested half as much as the second company in quality control, the first company is twice as efficient as the second company.