List all possibilities first:
Our four possibilities: X 1+X2, Y 1+Y2, X 1+Y2, X2+Y 1.
There are two possibilities for suppliers: X 1+X2 and y1+y2;
* * * There are eight combinations (considering that there are actually only six rules).
Self: Supplier:
1, X 1+X2 X 1+X2 condition: x1> Y 1,X2 & gt; Y2 Expense Variance: 0
2.X 1+X2 Y 1+Y2 condition: x1> Y 1,X2 & gt; Y2 X 1+X2 must be >: Y 1+Y2 does not exist.
3.Y 1+Y2 X 1+X2 condition: y1> X 1, Y2 & gtX2 Y 1+Y2 inevitably >: X 1+X2 this item does not exist.
4.Y 1+Y2 Y 1+Y2 condition: y1> X 1, Y2 & gtX2 Expense Variance: 0
5.X 1+Y2 X 1+X2 condition: X 1 >Y 1, Y2 & gtX2 cost difference: Y2-X2.
6.X 1+Y2 Y 1+Y2 condition: x1> Y 1, Y2 & gtX2 cost difference: X 1-Y 1.
7.X2+Y 1 X 1+X2 condition: y1> X 1,X2 & gt; Y2 cost variance: Y 1-X 1.
8.X2+Y 1 Y 1+Y2 condition: y1> X 1,X2 & gt; Y2 Expense Variance: X2-Y2
At this time, the concept of density = weight-volume density is positive:+density is negative:-total density = total weight-total volume introduction.
Profit and loss balance condition: the total density of the first batch of goods and the second batch of goods.
Case 1: 0++/
Case 4: 0-/
Case 5: Earn Y2-X2 ++
Scenario 6: Earn X 1-Y 1+-
Case 7: Earn Y 1-X 1-++
Case 8: Earn X2-Y2-+-
Conclusion:
1, the density is equal to the positive and negative (same number);
2. Profits with different densities:
3. When making a profit:
The total density is positive, earning a negative density value;
If the total density is negative, a positive density value is obtained;
4. When making a profit
It will always be the one with smaller difference in profit (weight and volume)!