There are five conditions, or characteristics, common to all civilizations

There are five conditions, or characteristics, common to all civilizations which are:

Advanced Cities: Where the civilization starts taking shape, people in a huge number live there making it the center of trade and commerce.

Institutions: An organized system or institution which can serve for a long period of time in a community.

Record Keeping: Traditions and ritual makes a fundamental part of a civilization, writing them or using any other method to preserve them.

Skilled Workers: Those who are capable of doing a certain job with specialty.

Advanced / Improved Technology: When a large number of people live together there are new problems and new solutions improving on the existing ones, those can be techniques or tools or anything which helps improve on the previous.  

when a country suffers, for example, a drought period, the market product is affected for a low offer, in this case, potatoes; the government has to tax to the households, which have to give more money for the potatoes which they consume, that situation make them consume substitute goods even through loans, it could increase the financial market movement and the inflationary phenomena, the business has to increase salaries in order to the employees could buy a more expensive food (potatoes) and in order to inflation tha business had to buy expensive supplies in the factor market, while the rest of the world have to gain more money to consume the same amount of potatoes.

athena gives perseus a mirror sp he won't directly look back at her.