Sentence:  For the purposes of the Contract, "Production Costs" shall mean the estimated costs of producing the Principal Company (including any contingency reserves), as described in the documents used in connection with the financing of such Company, including costs that may be paid, if permitted by the terms of such documents, by an <WSD>overcall</WSD> demand on investors, but not including any weekly  expenses. 
Meaning of the word marked with <WSD> tags:  An additional contribution required of investors beyond the initial investment, should unforeseen expenses arise.