when the oppotunity cost is a constant the PPF will be a stright line
Displacement of a straight line is zero...
A straight line has no vertex.
There are 180 degrees on a straight line.
Reaching the PPF, Deciding which point on the PPF, How and how much to distribute to consumers
The straight level line is said to be horizontal.
If the opportunity cost is constant, the PPF is a straight line; when the opp. cost of a good rises when it is produced more, then concave.
Operating at an inefficient point, i.e. inside the PPF and not on the edge or line of the PPF
Thunderstorms :)
line graphing
That the force that causes the acceleration is not constant.
Gravity. Things naturally travel in a straight line unless another force acts on them. The moon would travel in a straight line but is dragged down by the gravity of the earth. This constant acceleration towards the earth causes it to orbit the earth in a curve.
Gravity. (Or the shape of space - which is molded by gravity.)
why PPF in economics is negatively sloped
PPF - company - was created in 1991.
inertia
Inertia - or the absence of any force making it change direction.
The influence of earths rotation is called the Coriolis effect. The coriolis effect causes wind to curve instead of going in a straight line.