Final answer:
The Fourth Republic shared executive instability with the Third Republic due to frequent coalition changes in the legislature, resulting from a multi-party system that made it difficult for any single party to gain a legislative majority.
Step-by-step explanation:
After the Second World War, events in France indicated that the Fourth Republic had executive instability because of frequent changes of party coalitions in the legislature in common with the Third Republic. Unlike Britain's two-party system, France had multiple parties which often resulted in no single party winning a majority within the legislature. This necessitated the formation of coalition governments, which could be unstable and lead to frequent changes in government. The Third and Fourth French Republics both struggled with this political instability, which often undermined their effectiveness.
After the Second World War, events in France indicated that the Fourth Republic had legislative instability because of frequent dissolution of the legislature in common with the Third Republic.
Similar to the Third Republic, the Fourth Republic experienced a high turnover of coalition governments, which led to frequent dissolutions of the legislature. This instability in the legislative branch was a shared characteristic between the two republics.
For example, within the first ten years of the Third Republic, 50 different coalition governments were formed and fell. This legislative instability continued into the Fourth Republic, making it a common feature between the two.