00:01
So here we're talking about the idea of market supply and we're given the individual supply curves, right, in terms of quantity and price, right.
00:09
We're given supply 2, which starts at 2, sorry not supply squared, supply 2, which starts at 2, and then supply 1, which goes through the origin.
00:20
And we're given equations, right, p is equal to 2q1 and then p is equal to 2 plus q2.
00:28
Now the key to these things is that you can add quantities, not prices, right.
00:36
If person 1 supplies 1 and person 2 supplies 3, it does make sense that they together supply 4.
00:45
But if one person is willing to supply 8 and another is willing to supply 4, it doesn't mean that together they're willing to supply at 12, right.
00:53
Quantities of things add, but prices do not.
00:55
So i want to rewrite these equations, right.
00:57
This gives me q1 is equal to 2, sorry p over 2, and it gives me that q2 is equal to p minus 2, right.
01:11
Now i can add these things, right, but i have to be very, very careful because you don't want to introduce any negatives, right.
01:21
This is only true when the price is greater than 0 and this is only true when the price is greater than 0, the quantity is greater than 0, right.
01:29
We're in the first quadrant...