Let $ M(n )\equal{}\{\minus{}1,\minus{}2,\ldots,\minus{}n\}$. For every non-empty subset of $ M(n )$ we consider the product of its elements. How big is the sum over all these products?
1. **Define the problem and initial conditions:**
   Let \( M(n) = \{-1, -2, \ldots, -n\} \). We need to find the sum of the products of all non-empty subsets of \( M(n) \).

2. **Base case:**
   For \( n = 1 \), the only non-empty subset is \(\{-1\}\), and its product is \(-1\). Therefore, \( S(1) = -1 \).

3. **Inductive step:**
   Assume \( S(k) = -1 \) for some \( k \geq 1 \). We need to show that \( S(k+1) = -1 \).

4. **Consider \( M(k+1) = \{-1, -2, \ldots, -(k+1)\} \):**
   The sum of the products of all non-empty subsets of \( M(k+1) \) can be divided into two parts:
   - The sum of the products of all non-empty subsets of \( M(k) \).
   - The sum of the products of all subsets of \( M(k) \) each multiplied by \(-(k+1)\).

5. **Sum of products of all non-empty subsets of \( M(k) \):**
   By the inductive hypothesis, this sum is \( S(k) = -1 \).

6. **Sum of products of all subsets of \( M(k) \) each multiplied by \(-(k+1)\):**
   Each subset of \( M(k) \) can either include or exclude \(-(k+1)\). If it includes \(-(k+1)\), the product of the subset is the product of the subset without \(-(k+1)\) multiplied by \(-(k+1)\).

   Therefore, the sum of the products of all subsets of \( M(k) \) each multiplied by \(-(k+1)\) is:
   \[
   -(k+1) \cdot \left( \sum_{\text{subsets of } M(k)} \text{product of elements} \right)
   \]

7. **Sum of products of all subsets of \( M(k) \):**
   The sum of the products of all subsets of \( M(k) \) is \( S(k) + 1 \) because we need to include the empty subset (which has a product of 1).

8. **Combining the results:**
   \[
   S(k+1) = S(k) + \left( -(k+1) \cdot (S(k) + 1) \right)
   \]
   Substituting \( S(k) = -1 \):
   \[
   S(k+1) = -1 + \left( -(k+1) \cdot (-1 + 1) \right) = -1 + 0 = -1
   \]

9. **Conclusion:**
   By induction, \( S(n) = -1 \) for all \( n \geq 1 \).

The final answer is \( \boxed{-1} \).