Israel’s Iron Dome air defense system works well – here's how Hamas got around it

The Israeli missile defense has been built up over many years, with high levels of financial investment. How could Hamas afford to overwhelm it? Again, it all comes down to numbers. The missiles fired by Hamas cost about $600 each, and so they are about 100 times less expensive than the Iron Dome interceptors. The total cost to Israel of firing all of its interceptors is around $48 million. If Hamas fired 5,000 missiles, the cost would be only $3 million. 

Thus, in a carefully planned and executed strategy, Hamas accumulated over time a large number of relatively inexpensive missiles that it knew would overwhelm the Iron Dome defensive capabilities. Unfortunately for Israel, the Hamas attack represents a very clear example of military asymmetry: a low-cost, less-capable approach was able to defeat a more expensive, high-technology system...

https://theconversation.com/israels-iron-dome-air-defense-system-works-well-heres-how-hamas-got-around-it-215512