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

 From "G. Dai" To statalist@hsphsun2.harvard.edu Subject Re: st: Draw an offer curve (supply curve)? Date Wed, 2 Nov 2011 14:08:24 -0600

```By the way, is there any way to indicate the ID of the offered
quantity, that is the stairstep in the curve? Say, can we use
different colors to distinguish IDs in the offer curve?
thanks,

On Mon, Oct 24, 2011 at 7:07 AM, Brian P. Poi <bpoi@stata.com> wrote:
> 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:
>>
>>
>> 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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```