The signal would be: prices.
When the prices of a certain product is high, it would give signals to the seller to increase the production of that product.
the prices also determine how much material and type of production technique that the sellers can afford to use.
Yes, this is true!
The Indus Valley people who lived in the place which is today next to Harappa in Pakistan left behing them some inscriptions of these pictographs, which we can see today.
There are around 500 known pictographs in this script. Some of them are easy to decipher: for example "arrow" looks like an arrow.
The correct answer is: He led attacks on Spanish ships carrying treasure from the Americas.
Drake did a number of things to delight Elizabeth, including defeating the Spanish armada but he gained renown for his privateering.
There is also biodiversity due to the structure of ecosystem. Each creature has own genetic qualities, the people in the mountain have the genetic quality of bearing cold while the people in terai have the genetic quality of bearing hot.