Agriculture is the future?

In general, everything that could be sold was sold. Almost all people who needed and could afford, they put glass, and bought LCDs, houses, all kinds of furniture and appliances, etc..
Even the clothes they buy increasingly more difficult. But the food, well food and drugs will always sell. How to plant drugs is impossible for most, to produce food is much easier. And

Why do business in times of crisis?

The main reason to start business in difficult times is that power prices would definitely be lower. Maintenance costs of business are lower in a crisis than the rest. If for example some businesses need space, and must rent, is another opportunity. During an economic crisis, even lower rents, and so many businesses seeking rental space would benefit.

Investment in science can be very profitable

Future areas: biochemistry, telecommunications, medical devices, and anything else that could revolutionize any particular domain.

Most people want to make a deal (business) that gives them an immediate profit. Therefore some areas (most profitable) are exploited and others - do not have investors.  It is only natural that when you start a business to think about money. Money is the outcome of a business, the primary motivation. But money, should not be the goal in itself.

Bank card

In the past people used barter to trade, and then they used gold, then gold coins, silver, etc..
Then, with the explosion of industry and economic growth, needs become increasingly more and something else was needed. In large transactions, it was impossible to pay out in coins. For example, someone (a company) wanted to sell 1000 pieces of a valuable product. Was needed bags full of coins, so he introduced a new element of trading: bill.