Detailed Instructions: Given a text, write a compressed version of it in a single sentence.
Problem:The forecasting challenges retailers confront have been amplified in recent years by product proliferation in almost every category. As a result, demand forecast uncertainty has grown substantially, thereby increasing the level of inventory that must be held to meet customer service requirements.
Solution:
The forecasting challenges retailers confront have grown in recent years by product proliferation in most categories, so demand forecast uncertainty has grown substantially, increasing the inventory that must be held.