For a military empire, this is crucial. Incan cities were built high in the mountains on cliffs that dropped hundreds of feet. As a result, the Incas were in great shape and were some of the best runners in history. Mountains have lots of natural resources to sustain civilization, including fresh water and food.
Because there are no income limits on Roth 401(k) contributions, these accounts provide a way for high earners to invest in a Roth without converting a traditional IRA. In 2014, you can contribute up to $17,500 to a Roth 401(k), a traditional 401(k) or a combination of the two.ecause there are no income limits on Roth 401(k) contributions, these accounts provide a way for high earners to invest in a Roth without converting a traditional IRA. In 2014, you can contribute up to $17,500 to a Roth 401(k), a traditional 401(k) or a combination of the two.
Roth IRA Income Limits. You may contribute the full amount to your Roth IRA if your 2015 modified adjusted gross income is below $116,000 for singles ($183,000 for married). You may make partial contributions until your income hits $131,000 ($193,000 for married).oth IRA Income Limits. You may contribute the full amount to your Roth IRA if your 2015 modified adjusted gross income is below $116,000 for singles ($183,000 for married). You may make partial contributions until your income hits $131,000 ($193,000 for married).