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On the other hand , PPPs have a well-developed and successful framework , which has already produced valuable drugs for diseases of poverty and is showing promise in vaccine research . " The news from the political front , notably a possible alliance between the PPP and the ANP after a recent meeting between their top leaders , are not very encouraging as it could add further to the existing political uncertainty , " analysts said . Anyway , the use of GDP to compare incomes between countries is highly problematic - there are the problems with PPP , with hidden economies ( naturally higher in higher tax or lax control countries ) and the whole question of how beneficial the economic acitivities in two economies are comparatively.GDP is best used as a tool to grossly measure change within an economy where these other can be expected to be fairly constant over the short to middle term . In this respect , the idea of long-run PPP now enjoys perhaps its strongest support in more than thirty years , a distinct reversion in economic thought . In the last five years , public private partnerships ( PPPs ) have transformed the research landscape for malaria and other developing world diseases . These PPPs have shareholder agreements . " Even Ziaul Haq had issued same statement that he would not allow the PPP to form government , but time proved that the masses were with PPP , " Mr Zardari said . On a complaint filed by the PPP leaders from Larkana about setting up of polling stations , the CEC said he took cognizance of the complaint and called for report from the concerned district returning officer . PPPs and PBIs exhibit exceptional properties .