Market leaders riding secular tailwinds are likely to be profitable long-term investments.Those who succeed at building wealth in the stock market often do so by buying and holding stakes in companies that have the ability to expand steadily over time. Such companies can frequently be found in the technology and healthcare sectors -- two sources of innovations that sometimes reshape our lives.If you have $1,000 that you don't expect to need for bills or other contingencies, and that you can commit to your p ...