Oil prices have been in a free-fall for nearly four months, and Tuesday’s $4 plunge was the biggest drop in more than two years.

Since hitting a peak of over $107 in June, the price of West Texas Intermediate crude oil has since fallen over 24%. It dropped as far as $80 a barrel on Wednesday, the lowest since June 2012. Brent crude oil has also struggled, falling as low as $84.85 a barrel Wednesday. That’s the lowest since November 2010.

The oil price collapse, paired with gloomy global economic reports, has weighed on stocks, and commodity-correlated currencies, such as the Russian ruble, have suffered. Here’s a roundup of what analysts are saying about the energy price drop.

There’s too much supply.

The current free-fall in oil prices is drawing comparisons with the “bubble bursting” crash of 2008, although there are some key differences this time around, said Tarun Dang, managing partner with Trend-Wise Capital Management.

“While decline in demand was the key driver for the 2008 crash, the sharp drop in prices this time around is being caused by a supply glut. Continued growth in U.S. shale production and increase in non-OPEC countries oil exports have led to excess capacity,” he wrote in a note to clients.

Rising global tensions aren’t even boosting oil prices: “The impact of this increased U.S. oil production is quite immense, that unlike in the past, geopolitical tensions have been unable to push oil prices higher,” Dang wrote.

And too little demand.

What’s making the supply glut even worse? Slowing demand. The International Energy Administration lowered its crude oil demand projections for 2014 to about 200,000 barrels per day from the current 700,000 barrels per day. The IEA forecast is the lowest since 2009.

“Chinese demand seems to be softening and there are severe questions about the Eurozone’s recovery, leading the International Energy Agency to cut its outlook,” Scotiabank Economics wrote.

Total world oil demand is expect to grow at 1.05 million barrels per day this year. That’s well below the expected increase in production from non-OPEC countries alone, which is anticipated to grow by 1.68 million barrels per day in 2014, according to KAMCO research.

“Dynamics in the crude oil market are not supporting prices — to say the least,” said Scotiabank.

Economic growth concerns fuel fears.

Dragging oil demand may continue longer than many economists would like as global economies struggle to post strong recoveries, and some nations, such as Japan, substitute oil for natural gas and alternative fuel sources.

“One of the reasons for an extension in the decline was the disappointing German output that reinforced worries that global oil demand will falter,” wrote Dukascopy Bank in a note to clients.

Those fears are compounded by the International Monetary Fund’s global growth downgrade, which “reinforces the narrative of the last few weeks, meaning that demand is set to remain soft,” the bank said.

And then there’s the stronger U.S. dollar.

A stronger U.S. dollar isn’t helping prices. The dollar hit a 4-year high on Oct. 3 as measured by the Bloomberg Dollar Spot Index, which tracks the greenback against 10 global trading partners.

“Oil prices continued the downward movements during Sept-14 for the third consecutive month … as sluggish demand, ample supply and a strong U.S. dollar continued to be the key points pressuring the oil market,” KAMCO wrote to clients. “This is in addition to the pressures from the weak economic data from the world’s biggest energy consumers.”

If the U.S. dollar were to fall, oil prices would have been supported more than what the market has seen recently, Dukascopy Bank said.

OPEC won’t be coming to the rescue.

OPEC’s next meeting is scheduled for Nov. 27, and many experts are hoping the cartel will push up that date. That is looking unlikely, as is any help from OPEC to boost prices as Saudi Arabia sits quietly on the sidelines.

For most of the 21st century, Saudi Arabia has been willing to be the swing producer for the globe, helping to support oil prices. However, much of the rhetoric coming out of Riyadh indicates that the nation is not inclined to cut production or call for an early meeting, said Tom Kloza, chief oil analyst for GasBuddy.com.

“The Saudis are the Michael Jordan’s of OPEC and they don’t appear ready to take one for the team right now and cut unilaterally,” he said.

All of these factors will add up to a “very sloppy oil market,” said Kloza. “Speculation drives prices higher and is now probably driving prices lower.”