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Re: st: Draw an offer curve (supply curve)?


From   "Brian P. Poi" <bpoi@stata.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Draw an offer curve (supply curve)?
Date   Mon, 24 Oct 2011 08:07:46 -0500

G. Dai wrote:
Dear all,
I have a dataset on real offering behavior and I want to draw an
offering curve (supply curve) from the data set.
One simple example of the data is following:

ID    Qantity_Offered    Price_asked

1       10                         99
2        23                        90
1        5                          50
4       30                         32
3       39                         10
2       30                          0
4       20                          0
3       20                          0

ID is the individual participating in the trade, and quantity_offered
is the quantity they can offer at the price of Price_asked.
We can see some individuals just ask zero price for some quantities,
while ask a higher price for extra quantities.  My object is draw an
offer curve (supply curve) from the data in an efficient way because
the dataset  is big.

Any suggestion is appreciated.
Thanks and have a great weekend!

How about something like this:

. input id q p
1       10                         99
2        23                        90
1        5                         50
4       30                         32
3       39                         10
2       30                          0
4       20                          0
3       20                          0
end

. sort p                  // put data in ascending price order
. gen totalq = sum(q)     // running sum of total quantity offered
                          // for price <= p
. line p totalq, connect("stairstep")


Brian P. Poi
Senior Economist
StataCorp LP

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