Clark himself had great success in his early 20s in the travel agency business -- a field that barely exists today. The Internet has completely revolutionized the travel industry.
Technology changes and you can not stay stuck in the mud. One of the best ways to adapt is to get new education and training. Today, in large numbers, people have gone back to school.
There's often a question of whether training or education is tax deductible. The IRS recently lost a case that now makes it easier to get a tax deduction.
However, there are some general guidelines to be aware of: You can generally only claim a deduction if you're pursuing skills or training that's applicable to your current field of employment. If you make a complete pivot to another field, your educational expenses generally won't be deductible.
The New York Times has a Q & A that covers many basic questions about educational deductions pertaining to getting your M.B.A.