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Page 1: r+jts9k&`biYk-ouquqgv wyx9xamzqu{}|~{ {u{g uodiskussionspapiere.wiwi.uni-hannover.de/pdf_bib/dp-270.pdf ·

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( ¨w Db FHGaI \ eF è F .N� y ID ( ¨w Db FHGaI è eF \ F .£·[�f+[e£K[ejtk(�tngZ2[ejʳ-jt�"[]���a�&`+f9�A\_£Ñi}�&k([e�� D jtfa��\_h9k&[����a�

� D 0 ¨w Db FHGaI è eF \ F ( <g1. \ F ( <gi. e è F 6��dgsbjt[ \ F ( <g1.Sjt[�f?^Adgfb\_[]\_�(jtfC�(jtk � fa�Úi}f+�~\&\&���b�Y�&�tjtkH[]\_�tn ® jt[+jt�9i}^a�H[�«Cjtfa�&[©áb�t[�jtk&jtfª«Cjtf¸w�fb\_�(k&`+£·jlfC�(jtfÍ`+fª«ø Fpo 0 - Fpo jtfa��\ch+k&[]���a�/«a[ej·xA�([����+h+k&dgsbjtf+£·dg£·jtfA�&jlfCsbjY«C[©f+�g`+f+�K[efÔ«CjlkÍxA�&k(`+^a�&`+k¨«ajtk¨ÎQdu£°jtfC�(jtfas;j�«C[efC��u`9f+�?sbjt[S\c�&k([e^a�&jtkÏ¢Ç�adu�gjtf+[����}�

Db FHGaI � y Ib ohGaI ø F £ o y I \ Fpo 0 Db FHGaI � y IbohGaI ø F £ o y I (9) F £ o y I d � -�¿/(9- eF £ o y I gi. ¹) F £ o y I¹õ Fpo .�0Ck#Om2`+kKsbjt[$µ¶jt�gk&jY\(\_dgk&jtf�£·[e�Ê�gk&�u×gjtk&jlk·ÐDi}k&[]i}s+[��e[����}�Ê^giYf+fß«C[ej�\_jtk·xa���b�Y�&�tjtkKsbj¥�Vk&[�jY«C[��ujtf�±S�"[ejÖÎQdufa�&j¥�ÛDi}k(�edY�&xA�(`b«C[�jtfí�ljt[e�gjtf�n"xa���ª�}�&�ljtk·£·[�� � fC�Úi}f9�A\_�Djtk&�(jtfïè��7k&j¥�(xaiY£·h+�ejG�cw�fC�Vdgk&£�iY�&[edgf+jtf´éÒi}fb\c�&jt���ej»�Adgf

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