Actually, and I don't want to appear a know-all, but the number two is not 'synergistic'.
Cement and water can be classed as synergistic compunds, because when combined their effects are more than the sum of their individual effects. Therefore, water is said to have positive synergy; the number 2 could not, because it is always represents 1+1 in the equation (although, strangely, 2 to the power of 0 is 1 - check it on your calculator). Similarly, positive economic effects (eg cost savings) can be obtained by merging companies or centralising individual operations, therefore this could be cl