question:  What was the main reason the Masur company failed?
context: Zotul, youngest of the Masur brothers, stirred uneasily. Earthmen may come and Earthmen may go, but clay goes on forever ... and with it, the fame and fortune of the House of Masur." By this, he seemed to imply that the Thorabians would rob the Earthmen, which the Lorians would not. It was a common enough thing among the brothers Masur, as among everybody, to be frustrated in their desires. In spite of the fact that a terrestrial ship had landed at every Zurian city of major and minor importance, and all in a single day, it took some time for the news to spread. The kilns of the Pottery of Masur fired day and night to keep up with the demand for the new porcelain stoves. In three years, more than a million had been made and sold by the Masurs alone, not counting the hundreds of thousands of copies turned out by competitors in every land. This, for some unknown reason and much to the disgust of the Lorians, was set up in Thorabia. The remainder of the brothers Masur, on the other hand, preferred to remain in ignorance. And the business of the House of Masur continued to look up. "As I have always said from the beginning," chortled Director Koltan, "this coming of the Earthmen had been a great thing for us, and especially for the House of Masur." The result of the new flood was that in the following year, the sale of Masur ceramic table service dropped to less than a tenth. Alas for that suggestion, no newspaper would accept advertising from the House of Masur; all available space was occupied by the advertisements of the Earthmen. In their dozenth conference since that first and fateful one, the brothers Masur decided upon drastic steps. By the time ten years had passed since the landing of the first terrestrial ship, the Earthmen were conducting a brisk business in gas-fired ranges, furnaces and heaters ... and the Masur stove business was gone.
output:  the Earthmen improved and controlled everything on Zur
options:  Zotul relied on the Earthmen too much  the Earthmen improved and controlled everything on Zur  lack of effort from the brothers  the brothers borrowed too much to every pay it back