You buy 100 SPDRs? (Standard and? Poor's Depositary? Receipts) at $ 115 per? unit. A SPDR is a Standard and? Poor's Depositary Receipt. A SPDR is an exchange traded fund? (ETF) that is designed to generate the same return as the? S&P 500 index. You borrowed $ 3 comma 220 to make the? purchase. Assume that the borrowing is achieved by issuing? (short-selling) T-Bills. What are the portfolio weights on the SPDRs and? T-Bills positions? The portfolio weight on the SPDRs position is nothing . ?(Round to four decimal? places.) The portfolio weight on the? T-Bills position is