Your company decided to reduce prices. This is an opportunity to increas your sales results. Where will you start?

I would start with the existing costumer and then the prospects and...

B. Prospects

My order would be:

A. Existing Customers

B. Prospects

C. Ex-customers

A. Existing Customers

(To Retain existing customers because the present price might have influenced them a lot, it would be better to start with them to retain their loyalty with you and also for the product--for the other you have an upper edge at the first instance of price reduction. The 'Bird' in Hand always better)

all must be contacted in order to get the sales. The ex-customers will love the discount and existing can get the promotion offer too. 

C. Ex-customers who left us on account of price.

BETTER TO START WITH EXISTING CUSTOMER 

You must try options. I'd gone for three

option B

Well, It has two angles !!

From Mind: I would start with Ex-Customers followed by Prospects and then existing customer

From Heart: I would prefer to start with my Existing Customer since they are the one who believed in me. Then Ex Customers, in order to get back the lost business and then Prospects.

A. Existing Customers

C. Ex-customers

B. Prospects